Toads burrow in the summer to cool off from the hot temperatures. Sand is a poor thermal conductor, so a toad buried in the sand can stay cool, even in hot weather.

Many species of toads have hardened knobs on their back legs which they use to dig themselves backward down into the ground.

That said, not all toads will burrow. Rather than burrowing into the sand, some toads hide under rocks, logs, natural holes, or abandoned small mammal burrows.

Toads Burrow in the Summer to Escape the Heat

Toads are ectothermic or “cold-blooded” animals. This means that toads cannot generate their own body heat, so their body temperatures are close to the temperature of their environment.

In other words, their environment is the main influence on their body temperature.

This contrasts endothermic (warm-blooded) animals, like humans whose bodies can generate their own internal heat through their metabolism.

Due to being cold-blooded, toads are very vulnerable to temperature extremes.

If the summer temperature rises above a certain point, a toad can overheat and be killed or injured.

For this reason, many toads burrow in soft soil in the summer to escape extreme temperatures and only emerge when the conditions are more favorable.

While buried, toads rely on cutaneous respiration to breathe, and can even change their body positions to adjust heat exchange via conduction and radiation.

How deep toads burrow varies depending on the species and other factors. Some toads can burrow anywhere from 6 inches to over 3 feet deep.

Sometimes, Toads Estivate in the Summer

Many people know that toads hibernate in the winter, to survive the freezing temperatures.

However, freezing temperatures aren’t the only thing toads have to worry about.

Being cold-blooded animals, high summer temperatures are just as undesirable as the cold. This is where estivation (also spelled as aestivation) comes in.

Estivation is when an animal enters a state of dormancy to conserve energy when the environmental conditions are very hot and dry.

The breathing rate, heart rate, and general metabolic rate all decrease, just as they do in hibernation. Think of it as some sort of summer hibernation.

If the summer weather gets too harsh, toads will retreat into burrows or find a cool, moist place to estivate as they wait for the rain to come and the temperatures to drop.

If the rain comes, but the temperatures remain high, they will not emerge until the temperatures are cooler.

Other Reasons Toads Burrow in the Summer

Temperatures are not the only reasons toads may burrow in the summer. Toads may burrow for several other reasons.

1. Toads Burrow to Hide From Predators

Toads are fairly small creatures and are preyed on by many animals, such as birds, snakes, certain, small mammals, fish, and even large spiders.

For this reason, toads have developed many ways to defend themselves against predators.

Depending on the species, toads may rely on camouflage, toxic skin secretions, mimicry, and other tactics to ward off predators.

Many toads may also bury themselves in soft soil to go unnoticed by predators.

2. Toads Burrow to Ambush Prey

Toads are generally not fast-moving creatures. This means they can not actively chase after prey as some other predators do. Instead, they wait for the prey to come to them, by using a passive ‘sit and wait’ hunting strategy.

This is an ambush-style technique where the toad hides in shady areas or burrows slightly in the mud and then pounce on any prey that passes by.

Toads have sticky tongues that allow them to catch any moving insect that comes into range quickly.

Once a toad spots an insect, it launches its tongue to catch the prey. After catching the prey, the tongue wraps around it and coats it with sticky saliva.

The toad will then yank its tongue back with a force equal to twelve times greater than the force of gravity.

Once the insect is in the mouth, the toad will swallow it whole.

A toad can shoot out its tongue, capture an insect, and pull it back into its mouth within 07 seconds; which is five times faster than the human eye can blink. This speed makes it effective at catching even fast-flying insects such as flies.

Not All Toads Burrow in the Summer

While many toads will burrow when the summer temperatures get too harsh, it’s important to note that not all toads burrow.

Some toads will retreat to natural holes, or abandoned small mammal burrows. Other toads will hide under logs, in rock crevices, the foundations of old buildings, piles of rubble, and other hidden areas.

If you ever go around turning over large rocks, or logs during the summer, there’s a chance you could find toads hiding underneath.

Frequently Asked Questions

Where do toads go in the summer? In the summer, toads retreat to protected areas that can shield them from the hot temperatures. Some toads will burrow and burrow and bury themselves in soft soil, or leaf litter. Other toads will hide under rocks, logs, in the foundations of old buildings, and other cool hidden areas.

Why do toads burrow? Toads burrow for several reasons, including; hibernation, to escape the hot or cold temperatures, to hide from predators, and to ambush prey.

Conclusion

Frogs and toads have thin membranous skin that they use to breathe and absorb water.

Due to their permeable skin, toads are very prone to water loss from the skin, particularly in arid conditions.

For this reason, many toads will burrow and bury themselves if the summer weather gets too harsh.

Toads can stay burrowed for several weeks and only emerge when the rain falls, or the temperatures become more favorable.

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

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The post Why Do Toads Burrow In The Summer? first appeared on Snake Informer.

Despite their ability to breathe underwater through their skin, toads can drown. The oxygen they absorb while underwater is usually not enough to meet all their oxygen needs for a long time, so they can only stay submerged for a limited time before they have to surface to breathe air with their lungs.

For example, if a toad is entangled in a net, its oxygen stores will deplete rapidly and the toad may drown if it is unable to reach the surface.

Toad Tadpoles Can Not Drown (Usually)

Most toads start their lives as tiny tadpoles. Tadpoles are very different from adult toads because they’re adapted for a fully aquatic life (life in the water), while adult toads are adapted for a mostly terrestrial life.

Toad tadpoles have gills on either side of their head, and a flat paddle-like tail fin to help them move in the water.

At this stage, toad tadpoles breathe underwater through their gills, just like fish.

Their gills have an extensive capillary network very close to the skin surface; Oxygen that is dissolved in the water that comes in contact with their gills is absorbed into their bloodstream via diffusion.

At the same time, carbon dioxide from the bloodstream passes through the gills and is diffused into the water. This gaseous exchange allows them to stay underwater almost indefinitely.

However, sometimes toads lay eggs in water with low levels of dissolved oxygen – and when the tadpoles hatch, so they cannot get all the oxygen they need by absorbing it from the water. 

If tadpoles are in water with a low oxygen content and no way of getting any extra oxygen, they can drown. 

For this reason, most tadpole species also develop lungs in addition to their gills. To breathe air with their lungs, tadpoles need to break through the water’s surface to get a gulp of air. 

How Tadpoles Breathe Air

When they first hatch, the tadpoles are too feeble to break through the water’s surface. To get around this, they “bubble-suck”. 

To do this, they first stick their open mouths to the underside of the water’s surface. They then open their jaws wide and suck at the water’s surface. Doing this creates an air pocket that they can pinch off by quickly closing their jaws.

After they close their mouth, a portion of the fresh air bubble is forced down into their lungs. The excess air is then burped out as a small bubble that floats back up to the water’s surface. 

Once the tadpoles get bigger, they will be strong enough to break through the water’s surface for a gulp of air.

Adult Toads Can Drown

After a few weeks months, to a few months (depending on the species), the tadpoles will go through a process known as metamorphosis and transform into adults. 

During this process, they will lose their gills, and tails, and develop limbs for walking on land.

Once fully transformed, tiny toads typically less than an inch long will leave the water and live on land. These tiny frogs will grow into adults and once they mature, they will go back to the water to breed and lay their eggs.

Adult toads have well-developed lungs which they use to breathe air. They take air through their nostrils, and down into their lungs.

Apart from breathing using their lungs, frogs also can breathe through their skin and thin membranes in their mouth and throat to get extra oxygen.

The oxygen that comes in contact with their skin and membranes is absorbed into the bloodstream via diffusion.

At the same time, carbon dioxide from the bloodstream passes through the skin and membranes and is diffused into the atmosphere.

This process of “skin breathing” is known as cutaneous respiration (sometimes informally called “skin breathing”).

How Toads Breathe Underwater

When underwater toads can breathe using their lungs, instead, they breathe underwater by absorbing oxygen that comes in contact with their skin. 

Dissolved oxygen in the water that comes in contact with this skin is absorbed into the bloodstream via diffusion. At the same time, carbon dioxide from the bloodstream passes through the skin and is diffused into the water.

However, this method of breathing does not give most toads all the oxygen they need, so they can only be underwater for a limited time before they have to resurface for a gulp of air. 

Prolonged stays underwater can lead to suffocation and drowning.

How Long Can a Toad Stay Submerged Before Drowning? 

How long a toad can stay underwater before drowning is mainly dependent on 4 factors, namely: how much dissolved oxygen there is in the water, the temperature, the toad species, and how active the toad is.

Depending on these factors, most toads can stay underwater from a few minutes to several hours at a time.

1. How Much Dissolved Oxygen Is in the Water

Toads can stay submerged in water with a high oxygen content for much longer than they can in water with a low oxygen content. The oxygen content of the water is affected by several factors including the following:

• The Nature of the Water 

Oxygen from the air is dissolved in water at its surface, mostly through turbulence (for example, waves, riffles, water tumbling over rocks, etc). For this reason, fast-moving water (such as a stream) will have a higher oxygen content than stagnant water.

If water is very stagnant, oxygen only dissolves on the water’s surface, and anything below the upper layer of the water will have a low oxygen content.

• Presence or Absence of Aquatic Plants and Algae 

Aquatic plants and algae also affect how dissolved oxygen is in a body of water. During the daylight hours, they produce oxygen through photosynthesis and release it into the water.

At night, aquatic plants and algae will use up dissolved oxygen in the water via aerobic respiration and release carbon dioxide into the water.

For these reasons, the concentrations of dissolved oxygen in water with lots of photosynthesizing aquatic vegetation will be highest in the mid-to-late afternoon when photosynthesis rates are greatest and will reach the lowest concentrations just before the sun rises the next morning.

• How Much Dead Matter /Waste Is the Water 

Water with lots of decaying plants and other organic matter (Sewage, yard waste, etc) will have a lower oxygen content. This is because the bacteria responsible for the process of decomposition use oxygen and release carbon dioxide into the water, reducing the oxygen content of the water.

• Altitude/Atmospheric Pressure  

Water at lower altitudes can hold more dissolved oxygen than water at higher altitudes. With rising altitude, the atmospheric pressure decreases – hence less oxygen can dissolve into water.

For this reason, water at higher altitudes typically has less dissolved oxygen than water at lower altitudes.

• The Concentration of Dissolved Salts Present in the Water (Salinity)

Water with a high mineral content (high salinity) can hold less dissolved oxygen than water with a low mineral content (low salinity).

2. Temperature

Like all amphibians, toads are cold-blooded (ectothermic) animals.

This means they cannot internally regulate their body temperature. Instead, their body temperature changes with the temperature in their surroundings.

In other, their environment is the main influence on their body temperature.

For example, a toad swimming in 30°C (86°F) water has a body temperature very close to 30°C. In water at 15°C (59°F), the body temperature of the same toad is around 15°C.

Being ectothermic means toads will have a varied rate of metabolism, depending on the water temperature.

Warmer water temperatures increase metabolic rates. This means toads have to resurface more often to get oxygen.

On the opposite end, cooler water allows toads to conserve oxygen. This extends the time they can hold their breath.

All this combined means toads can stay underwater at lower temperatures for much longer than they can at warmer temperatures.

3. Species

Tadpoles have gills that provide a very large surface area to absorb lots of oxygen from the water. However, as adults, frogs do not have gills, so how much oxygen they can absorb from the water depends on their skin surface area.

Some toad species are more adept at holding their breath than others and thus can stay underwater longer.

4. How Active the Toad Is

Activity affects how much oxygen the body needs.

Think about it. When you are running or jogging, you breathe in much quicker breaths than when you are lying on the couch.

For toads, this is also true. Their oxygen demands will be influenced by their activity levels.

A toad that is resting on the bottom of the water may be able to stay submerged for several hours.

On the other hand, an individual of the same species who is escaping a predator may only be able to stay underwater for a few minutes before needing to surface to replenish its oxygen supply.

Frequently Asked Questions (FAQS)

Can toads drown in water? Toads can drown in water, Even with their ability to breathe underwater through their skin. They have lungs, and If their lungs fill with water, they can drown.

Can toads drown in a pool? Toads can drown in a pond if they fall in and have no way of getting out of the water. They have very absorbent skins, so chlorine and other chemicals found in pools can penetrate their skin and seriously harm or even kill them.

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

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The post Can Toads Drown? first appeared on Snake Informer.

Toads bury themselves in the dirt for several reasons, including cooling off from the heat, hiding from predators, hibernating, and ambushing prey.

Many species of toads have hardened knobs on their back legs which they use to dig themselves backwards down into the ground.

That said, it’s important to note that not all toads bury themselves in dirt.

Rather than burying themselves in the dirt, some toads choose to hide under rocks, logs, natural holes, or abandoned small mammal burrows.

Toads Bury Themselves to Escape the Heat or Cold

Toads are ectothermic or “cold-blooded” animals. This means that toads cannot generate their own body heat, so their body temperatures are close to the temperature of their environment.

In other words, their environment is the main influence on their body temperature.

This is in contrast to endothermic (warm-blooded) animals, like humans whose bodies can generate their own internal heat through their metabolism.

Due to being cold-blooded, toads are very vulnerable to temperature extremes.

If the temperature rises above a certain point, a toad can overheat and be killed or injured.

On the opposite end, If the temperatures drop too low, a toad can be harmed.

For this reason, many toads bury themselves in soft soil or mulch to escape extreme temperatures and only emerge when the conditions are more favorable.

While buried, toads rely on cutaneous respiration to breathe, and can even change their body positions to adjust heat exchange via conduction and radiation.

Toads Bury Themselves to Hide From Predators

Toads are fairly small creatures and are preyed on by many animals, such as birds, snakes, certain, small mammals, fish, and even large spiders.

For this reason, toads have developed many ways to defend themselves against predators.

Depending on the species, toads may rely on camouflage, toxic skin secretions, mimicry, and other tactics to ward off predators.

Many toads may also bury themselves in soft soil to go unnoticed by predators.

Toads Bury Themselves to Ambush Prey

Toads are generally not fast-moving creatures. This means they can not actively chase after prey as some other predators do. Instead, they wait for the prey to come to them, by using a passive ‘sit and wait’ hunting strategy.

This is an ambush-style technique where the toad hides in shady areas or burrows slightly in the mud and then pounce on any prey that passes by.

Toads have sticky tongues that allow them to catch any moving insect that comes into range quickly.

Once a toad spots an insect, it launches its tongue to catch the prey. After catching the prey, the tongue wraps around it and coats it with sticky saliva.

The toad will then yank its tongue back with a force equal to twelve times greater than the force of gravity.

Once the insect is in the mouth, the toad will swallow it whole.

A toad can shoot out its tongue, capture an insect, and pull it back into its mouth within 07 seconds; which is five times faster than the human eye can blink. This speed makes it effective at catching even fast-flying insects such as flies.

Toads Bury Themselves to Hibernate

During the winter, toads in cold regions hibernate to protect themselves from freezing temperatures.

Many toads will hibernate underground, where the frost does not penetrate.

This could be in natural holes or abandoned mammal burrows that are deep enough that the frost does not penetrate all the way to the bottom.

However, some toads will dig their own hibernacula (hibernating space).

They use their back legs to ‘knead’ their bodies into the soil, submerging themselves completely until they are below the frost line.

Toads will die if they freeze, so they need to stay below the frost line all winter.

How deep they dig varies from year to year depending on the temperatures and snow cover.

For example, many toads will burrow anywhere from 6 inches to over 3 feet deep; they tend to stay a couple of inches of the frost line and will move up and down throughout the winter as the frost line changes.

Toads Bury Themselves to Escape Arid Conditions

Frogs and toads have thin membranous skin that they use to breathe and absorb water.

Due to their permeable skin, toads are very prone to water loss from the skin, particularly in arid conditions.

During dry periods, some toads will bury themselves to reduce water loss.

Once buried toads may estivate as they wait for the rain to come and the temperatures to drop.

Some toad species even form a cocoon of dead skin cells around their bodies to limit water loss.

Conclusion

Most toads will spend some of their underground. This could be in natural holes or abandoned mammal burrows.

Some toads will also burrow into soft soil, and bury themselves.

While buried, toads meet their oxygen needs by absorbing oxygen from the surrounding soil via the skin (cutaneous respiration).

Sources:

Reynolds SJ, Christian KA, Tracy CR. The cocoon of the fossorial frog Cyclorana australis functions primarily as a barrier to water exchange with the substrate. Physiol Biochem Zool. 2010 Sep-Oct;83(5):877-84. doi: 10.1086/656218. PMID: 20687829.

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

snakeinformer.com

The post Why Do Toads Bury Themselves in Dirt? first appeared on Snake Informer.

Generally, toads can stay underwater for 15 to 30 minutes before returning to the surface for air. However, activity levels will affect the length of time a toad can stay underwater. A resting toad can stay underwater for much longer than an active toad.

Other factors that influence how long a toad can stay underwater include the species, water temperature, and the oxygen content of the water.

Toad Tadpoles Can Stay Underwater for an Unlimited Time

Most toads start their lives as tiny tadpoles. Tadpoles are very different from adult toads because they’re adapted for a fully aquatic life (life in the water), while adult toads are adapted for a mostly terrestrial life.

Toad tadpoles have gills on either side of their head, and a flat paddle-like tail fin to help them move in the water.

At this stage, toad tadpoles breathe underwater through their gills, just like fish.

Their gills have an extensive capillary network very close to the skin surface; Oxygen that is dissolved in the water that comes in contact with their gills is absorbed into their bloodstream via diffusion.

At the same time, carbon dioxide from the bloodstream passes through the gills and is diffused into the water. This gaseous exchange allows them to stay underwater almost indefinitely.

Sometimes, Toad Tadpoles Breathe Air

Tadpoles sometimes live in water with low oxygen levels – where their gills (and skin) cannot absorb sufficient oxygen. This means they also need to breathe air. For this reason, most toad tadpole species also develop lungs in addition to their gills.

When they first hatch, the tadpoles are too feeble to break through the water’s surface for a gulp of air. To get around this, they “bubble-suck”.

To do this, they first stick their open mouths to the underside of the water’s surface. They then open their jaws wide and suck at the water’s surface. Doing this creates an air pocket that they can pinch off by quickly closing their jaws.

After they close their mouth, a portion of the fresh air bubble is forced down into their lungs.

Since the tadpoles are tiny, they usually cannot absorb the entire air bubble, and the excess is burped out as a small bubble, after which it floats back up to the water’s surface.

Once the tadpoles get bigger, they will be strong enough to break through the water’s surface for a gulp of air.

Tadpoles Transform Into Toadlets

After a period of 2 to 3 weeks to as long as over 3 months (depending on the species), the tadpoles go through a process known as metamorphosis. In this process, they lose the features that help them live in the water and develop features more suitable for living on land.

During this process;

• They lose their gills and get well-developed lungs for breathing air
• The tail shortens and is eventually absorbed into the body
• They develop strong legs for moving on land

Once this process is complete, tiny toadlets (small toads), typically half an inch long will leave the water and live a fully terrestrial life.

These toadlets will grow into adult toads and once they mature, they will go back to the water to breed and lay their eggs.

Adult Toads Can Only Stay Underwater for a Limited Time

Unlike tadpoles, adult toads do not have gills. They breathe using their lungs and by absorbing oxygen through their skin.

While underwater, they can not breathe with their lungs, so they have to hold their breath and breathe entirely through their skin (cutaneous respiration).

Dissolved oxygen in the water that comes in contact with their skin is diffused into their bloodstream, and carbon dioxide is released from the bloodstream into the water.

However, this method of breathing usually does not give toads all the oxygen they need, so they can only be submerged for a limited time before they have to resurface to breathe air with their lungs.

How Long a Toad Can Stay Underwater Is Mainly Dependent on 4 Factors

How long a toad can stay underwater is mainly dependent on 4 factors, namely: how much dissolved oxygen there is in the water, the temperature, the toad species, and how active the toad is.

Depending on these factors, most toads can stay underwater from a few minutes to several hours at a time.

1. How Much Dissolved Oxygen Is in the Water

Toads can stay submerged in water with a high oxygen content for much longer than they can in water with a low oxygen content. The oxygen content of the water is affected by several factors including the following:

• The Nature of the Water 

Oxygen from the air is dissolved in water at its surface, mostly through turbulence (for example waves, riffles, water tumbling over rocks, etc). For this reason, fast-moving water (such as a stream) will have a higher oxygen content than stagnant water.

If water is very stagnant, oxygen only dissolves on the water’s surface, and anything below the upper layer of the water will have a low oxygen content.

• Presence or Absence of Aquatic Plants and Algae 

Aquatic plants and algae also affect how dissolved oxygen is in a body of water. During the daylight hours, they produce oxygen through photosynthesis and release it into the water.

At night, aquatic plants and algae will use up dissolved oxygen in the water via aerobic respiration and release carbon dioxide into the water.

For these reasons, the concentrations of dissolved oxygen in water with lots of photosynthesizing aquatic vegetation will be highest in the mid-to-late afternoon when photosynthesis rates are greatest and will reach the lowest concentrations just before the sun rises the next morning.

• How Much Dead Matter /Waste Is the Water 

Water with lots of decaying plants and other organic matter (Sewage, yard waste, etc) will have a lower oxygen content. This is because the bacteria responsible for the process of decomposition use oxygen and release carbon dioxide into the water, reducing the oxygen content of the water.

• Altitude/Atmospheric Pressure  

Water at lower altitudes can hold more dissolved oxygen than water at higher altitudes. With rising altitude, the atmospheric pressure decreases – hence less oxygen can dissolve into water.

For this reason, water at higher altitudes typically has less dissolved oxygen than water at lower altitudes.

• The Concentration of Dissolved Salts Present in the Water (Salinity)

Water with a high mineral content (high salinity) can hold less dissolved oxygen than water with a low mineral content (low salinity).

2. Temperature

Like all amphibians, toads are cold-blooded (ectothermic) animals.

This means they cannot internally regulate their body temperature. Instead, their body temperature changes with the temperature in their surroundings.

In other, their environment is the main influence on their body temperature.

For example, a toad swimming in 30°C (86°F) water has a body temperature very close to 30°C. In water at 15°C (59°F), the body temperature of the same toad is around 15°C.

Being ectothermic means toads will have a varied rate of metabolism, depending on the water temperature.

Warmer water temperatures increase metabolic rates. This means toads have to resurface more often to get oxygen.

On the opposite end, cooler water allows toads to conserve oxygen. This extends the time they can hold their breath.

All this combined means toads can stay underwater at lower temperatures for much longer than they can at warmer temperatures.

3. Species

Tadpoles have gills that provide a very large surface area to absorb lots of oxygen from the water. However, as adults, frogs do not have gills, so how much oxygen they can absorb from the water depends on their skin surface area.

Some toad species are more adept at holding their breath than others and thus can stay underwater longer.

4. How Active the Toad Is

Activity affects how much oxygen the body needs.

Think about it. When you are running or jogging, you breathe in much quicker breaths than when you are lying on the couch.

For toads, this is also true. Their oxygen demands will be influenced by their activity levels.

A toad that is resting on the bottom of the water may be able to stay submerged for several hours.

On the other hand, an individual of the same species who is escaping a predator may only be able to stay underwater for a few minutes before needing to surface to replenish its oxygen supply.

Can Toads Drown?

Even with their ability to breathe underwater through their skin, toads can drown. Toads have lungs, and If their lungs fill with water, they can drown.

The oxygen they absorb through their skin is usually not enough to meet all their oxygen needs for long, so they can only stay submerged for a limited time before they will have to surface to breathe air with their lungs.

If a toad dives into the water so deep that it can not surface for air in time, it will drown.

Conclusion

Toads are semi-aquatic animals, which means they spend part of their lives on land, and part in the water. They start their lives as tadpoles with gills for breathing underwater. At this stage of their life, frogs (tadpoles) can stay underwater for as long as they can get enough oxygen through their gills.

Over time, the tadpoles will transform into toadlets through the process of metamorphosis. During this process, they lose their gills and develop functional lungs.

Once fully transformed, the toadlets will leave the water for life on land. Adult toads breathe by using their lungs and absorbing oxygen through their skin and thin membranes in their mouths and throats.

When underwater, they breathe entirely by absorbing dissolved oxygen in the water through their skin.

This does usually not meet all their oxygen requirements, so they can only stay underwater for a limited amount of time before they have to surface to breathe.

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

snakeinformer.com

The post How Long Can Toads Stay Underwater? first appeared on Snake Informer.

Toads can breathe underwater via cutaneous respiration. Dissolved oxygen in the water that comes in contact with their skin is absorbed into the bloodstream via diffusion, and carbon dioxide is released from the bloodstream into the water.

However, this method of breathing does not give them all the oxygen they need, so they can only be underwater for a limited time before they have to resurface to breathe air with their lungs.

Toad Tadpoles Can Breathe Underwater With Their Gills

Most toads start their lives as tiny tadpoles. Tadpoles are very different from adult toads because they’re adapted for a fully aquatic life (life in the water), while adult toads are adapted for a mostly terrestrial life.

Toad tadpoles have gills on either side of their head, and a flat paddle-like tail fin to help them move in the water.

At this stage, toad tadpoles breathe underwater through their gills, just like fish.

Their gills have an extensive capillary network very close to the skin surface; Oxygen that is dissolved in the water that comes in contact with their gills is absorbed into their bloodstream via diffusion.

At the same time, carbon dioxide from the bloodstream passes through the gills and is diffused into the water.

Sometimes, Toad Tadpoles Breathe Air

Tadpoles sometimes live in water with low oxygen levels – where their gills (and skin) cannot absorb sufficient oxygen. This means they also need to breathe air. For this reason, most toad tadpole species also develop lungs in addition to their gills.

When they first hatch, the tadpoles are too feeble to break through the water’s surface for a gulp of air. To get around this, they “bubble-suck”.

To do this, they first stick their open mouths to the underside of the water’s surface. They then open their jaws wide and suck at the water’s surface. Doing this creates an air pocket that they can pinch off by quickly closing their jaws.

After they close their mouth, a portion of the fresh air bubble is forced down into their lungs.

Since the tadpoles are tiny, they usually cannot absorb the entire air bubble, and the excess is burped out as a small bubble, after which it floats back up to the water’s surface.

Once the tadpoles get bigger, they will be strong enough to break through the water’s surface for a gulp of air.

Tadpoles Transform Into Toadlets

After a period of 2 to 3 weeks to as long as over 3 months (depending on the species), the tadpoles go through a process known as metamorphosis. In this process, they lose the features that help them live in the water and develop features more suitable for living on land.

During this process;

• They lose their gills and get well-developed lungs for breathing air
• The tail shortens and is eventually absorbed into the body
• They develop strong legs for moving on land

Once this process is complete, tiny toadlets (small toads), typically half an inch long will leave the water and live a fully terrestrial life.

These toadlets will grow into adult toads and once they mature, they will go back to the water to breed and lay their eggs.

Adult Toads Breathe Underwater Through Their Skin

Adult toads have well-developed lungs which they use to breathe air. They take air through their nostrils, and down into their lungs.

That said, amphibian lungs are quite primitive when compared to our own. They usually can not give a toad all the oxygen it needs.

For this reason, toads also have the ability to breathe through their skin and thin membranes in their mouth and throat to get extra oxygen.

The skin contains a large network of capillaries and other blood vessels close to the surface. The oxygen that comes in contact with their skin and membranes is absorbed into the bloodstream via diffusion.

At the same time, carbon dioxide from the bloodstream passes through the skin and membranes and is diffused into the atmosphere.

This process of “skin breathing” known as cutaneous respiration is very similar to what happens inside our lungs.

How Toads Breathe Underwater

Toads breathe underwater via cutaneous respiration. Dissolved oxygen in the water that comes in contact with their skin is absorbed into the bloodstream via diffusion. At the same time, carbon dioxide from the bloodstream passes through the skin and is diffused into the water.

However, this method of breathing does not give them all the oxygen they need, so they can only be underwater for a limited time before they have to resurface to breathe air with their lungs.

How Long Can Toads Stay Underwater?

Exactly how long a toad can stay underwater depends on how much oxygen it needs vs how much oxygen it can absorb from the water through its skin.

This is usually affected by: how much dissolved oxygen there is in the water, the temperature, and how active the toad is

1. How Much Oxygen There Is in the Water

Fast-moving or ‘stirred up’ water generally contains more oxygen than still water. This is because oxygen from the atmosphere mixes with the water more easily.

If water is very still, oxygen only dissolves on the water’s surface, and anything below the upper layer of the water will have a low oxygen content.

Additionally, aquatic plants and algae also affect the dissolved oxygen in a body of water. During the daylight hours, they produce oxygen through photosynthesis and release it into the water.

At night, aquatic plants and algae will use up dissolved oxygen in the water via aerobic respiration and release carbon dioxide into the water.

For these reasons, the concentrations of dissolved oxygen in water with lots of photosynthesizing aquatic vegetation will be highest in the mid-to-late afternoon when photosynthesis rates are greatest and will reach the lowest concentrations just before the sun rises the next morning.

Also, water with lots of decaying plants will have a lower oxygen content. This is because the bacteria responsible for the process of decomposition use oxygen and release carbon dioxide into the water, reducing the oxygen content of the water.

Toads can stay underwater in water with a high oxygen content for much longer than they can in water with a low oxygen content.

2. The Temperature

Toads are ectothermic (cold-blooded) animals, so the environmental temperatures will affect their rate of metabolism. At higher temperatures, they will have a higher metabolic rate, meaning they have a greater oxygen demand.

At lower temperatures, the opposite is true. Toads will have a lower metabolic rate meaning they have a lower oxygen demand.

Also, the temperature will affect the oxygen content of the water. More oxygen will dissolve into the water at colder temperatures, than at warmer temperatures.

This means toads can stay underwater at lower temperatures for much longer than they can at warmer temperatures.

3. How Active the Toad Is

Activity affects how much oxygen the body needs. Think about it, when we are running or jogging, we breathe heavier and in much quicker breaths than when we are lying on the couch.

For toads, this is also true. They will have a higher oxygen demand when they are very active in the water (escaping a predator for example), and a lower oxygen demand when they are inactive.

For this reason, toads will be able to stay underwater when at rest for much longer than when they are active.

Can Toads Drown?

Even with their ability to breathe underwater through their skin, toads can drown. Toads have lungs, and If their lungs fill with water, they can drown.

The oxygen they absorb through their skin is usually not enough to meet all their oxygen needs for long, so they can only stay submerged for a limited time before they will have to surface to breathe air with their lungs.

If a toad dives into the water so deep that it can not surface for air in time, it will drown.

Final Thoughts

Toads are semi-aquatic animals, which means they spend part of their lives on land, and part in the water. They start their lives as tadpoles with gills for breathing underwater. At this stage of their life, frogs (tadpoles) can stay underwater for as long as they can get enough oxygen through their gills.

Over time, the tadpoles will transform into toadlets through the process of metamorphosis. During this process, they lose their gills and develop functional lungs.

Once fully transformed, the toadlets will leave the water for life on land. Adult toads breathe by using their lungs and absorbing oxygen through their skin and thin membranes in their mouths and throats.

When underwater, they breathe entirely by absorbing dissolved oxygen in the water through their skin.

This does usually not meet all their oxygen requirements, so they can only stay underwater for a limited amount of time before they have to surface to breathe.

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

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The post Can Toads Breathe Underwater? first appeared on Snake Informer.

The majority of amphibian species can not live in saltwater because salt tends to disrupt the water and ionic exchange across their permeable skin. This can lead to serious dehydration or even death. In contrast, many reptiles such as sea snakes and saltwater crocodiles inhabit marine habitats.

That said, a few amphibian species, such as the the crab-eating frog (Fejervarya cancrivora) have adapted to survive salt habitats.

Most Amphibians Can Not Live In Saltwater

Amphibians have unique skin compared to that of many other vertebrates. Their skin is composed of thin membranous tissue that is quite permeable to water and contains a large network of blood vessels.

This permeable skin distinguishes them from mammals, birds, or reptiles.

Permeability relates to how easily a gas or liquid molecule can pass back and forth from the environment into the animal and vice versa.

Typically, the larger the molecule, the more difficult it is to enter the animal through its skin. Amphibian skin is more permeable than that of other vertebrates.

Their membranous skin allows water and respiratory gases to readily diffuse directly down their gradients between the blood vessels and the surroundings.

When in fresh water, amphibians such as frogs have a body salt content much higher than the surrounding water. For this reason, they absorb water by osmosis and lose salts by diffusion through the skin.

Their physiology compensates for this, so the concentration of their body fluids is maintained at an adequate level.

However, when amphibians are in salt water, the water around them is much more concentrated than their body fluids, especially their blood. Due to this, they would lose water rapidly and gain salts – leading to quick dehydration, or even death.

The vulnerability of amphibians to saltwater is why generally don’t find any frogs or salamanders on small oceanic islands.

This is in contrast to reptiles such as sea snakes which frequently live in seas, and inhabit oceanic islands.

Some Amphibian Species Are Known To Have Salt Tolerance

Although most amphibians are vulnerable to saltwater, an increasing number of studies have found amphibian species that are able to adapt to and tolerate saltwater habitats, especially those that live along the coast.

In 2015, American scentists Gareth R Hopkins, and Jr. Edmund D. Brodie identified 144 amphibian species from 28 amphibian families across the world, of which 124 are anurans (frogs and toads).

A few frog and toad species with a known tolerance to saltwater include the following:

• Lowland Leopard Frog (Lithobates yavapaiensis)
• Southern Leopard Frog (Rana sphenocephala)
• Crab-eating frog (Fejervarya cancrivora)
• Pacific Treefrog (Pseudacris regilla)
• Asian grass frog (Fejervarya limnocharis)
• Chinese bullfrog (Hoplobatrachus rugulosus) 
• Ornate chorus frog (Microhyla fissipes)
• African Clawed Frog (Xenopus laevis)
• Mediterranean painted frog (Discoglossus pictus)
• Western Toad (Anaxyrus boreas)
• Yellow-Bellied Toad (Bombinatoridae Bombina variegata)
• Cane Toad (Rinella marinus)
• American Toad (Anaxyrus americanus)
• Fowler’s Toad (Anaxyrus fowleri)
• Southern Toad (Anaxyrus terrestris)
• Oak Toad (anaxyrus quercicus)
• European toad (Bufo bufo)
• Natterjack toad (Epidalea calamita)
• Berber Toad (Sclerophrys mauritanica)
• Balearic green toad (Bufotes balearicus)
• African green toad (Bufotes boulengeri)
• European green toad (Bufotes viridis)

These frogs and toads often live in coastal areas that get flooded by seawater, so they developed tolerance to brackish water as a survival strategy.

For example, mangrove swamps are frequently flooded daily by tidal fluctuations which results in some levels of salt water in surrounding standing water.

The Crab-eating Frog

The crab-eating frog (Fejervarya cancrivora), of south-eastern Asia is pehraps the most well-known frog to inhabit salt environments.

These frogs occur in a range of lowland habitats, but in their native environment, they are found in coastal scrub, marshes, mangroves, and coastal rice paddies.

These unique frogs can survive in fresh water, and when pushed can tolerate at least up to 80% sea water, and can adapt from one to the other in a matter of hours. However, they generally prefer a seawater concentration of not more than 40%.

Crab-eating frogs are able to survive salt water by rapidly changing levels of urea in their body tissues. Doing this prevents excessive water loss through the skin in salty conditions.

In addition, Crab-eating frogs have three glands within their skin (mucous glands, mixed glands, and vacuolated glands), which help buffer the additional salt that would otherwise enter their bodies.

Other Anurans With Tolerance To Saltwater

Apart from the crab-eating frog, another frog/toad species with amazing tolerance to seawater is the green toad (Bufo viridi) of Europe and the Middle East

Adult green toads have been found in aquatic environments with salinities as high as 2.0% in northern Europe

They have also been shown to tolerate, external salinities as high as 2.9%, for periods up to at least a month. For context, coastal seawater usually has a salinity of about 3.1%.

Many Amphibians Have Adaptations To Live In Harsh Environments

With amphibians having a wide distribution, some species live in very harsh environments. For this reason, they developed adaptations to help them live in these environments.

In addition to being able to tolerate saline habitats, green toads (Bufotes viridis), are more tolerant to arid conditions than many other amphibians.

These toads can tolerate extremely high temperatures of 40°C (104°F). They are also quite tolerant to desiccation and can withstand losing up to 50% of their body water (they only die when they lose more than 50% of their body water).

Another frog species with tolerance to arid conditions is the waxy monkey leaf frog (Phyllomedusa sauvagii) of South America.

These frogs can tolerate a wide range of body temperatures about 20 (68°F) and 40°C (104°F) – and have been shown to be able to modulate their body temperature through control of evaporative water loss.

In addition, waxy monkey leaf frogs limit water loss through the skin by lipid secretions and excretion of uric acid. During the day, they enter a state of torpor to conserve water.

Sources:

Gareth R. Hopkins and Edmund D. Brodie “Occurrence of Amphibians in Saline Habitats: A Review and Evolutionary Perspective,” Herpetological Monographs 29(1), 1-27, (1 December 2015). https://doi.org/10.165/HERPMONOGRAPHS-D-14-00006

Malcolm S. Gordon, Knut Schmidt-Nielsen, Hamilton M. Kelly; Osmotic Regulation in the Crab-Eating Frog (Rana Cancrivora). J Exp Biol 1 September 1961; 38 (3): 659–678. doi: https://doi.org/10.1242/jeb.38.3.659

Malcolm S. Gordon; Osmotic Regulation in the Green Toad (Bufo Viridis). J Exp Biol 1 June 1962; 39 (2): 261–270. doi:https://doi.org/10.1242/jeb.39.2.261

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

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The post Can Amphibians Live In The Ocean? (Explained Simply first appeared on Snake Informer.

Most frogs and toads will lay their eggs in the water, but many will lay their eggs on land.

Amphibian eggs laid in the water can be difficult to tell apart unless you have a close eye to watch for differences.

The easiest way to tell the difference between frog eggs and toad eggs is to look at how the eggs are laid. Most frogs lay their eggs in large clusters, while most toads lay their eggs in long jelly-covered strings, which may look like a string of black beads.

That said, it’s important to note that not all toads lay their eggs in long strings.

A few toad species, such as the red-spotted toad (Anaxyrus punctatus) lay their eggs singly.

Some frog species also lay their eggs singly, or in small packets on the surface of the water (more information on that is below).

Where Do Frogs and Toads Lay Their Eggs?

Generally, many frog and toad species prefer to lay their eggs in shallow standing, or slow-moving, temporary, or semi-permanent freshwater bodies that are free of fish and have little to moderate amounts of vegetation.

This could be in woodland ponds, flooded fields, seasonal pools, temporary rain puddles, flooded ditches, lake edges, river backwaters, open marshes, swamps, artificial ponds, and even deep tire tracks or potholes filled with rainwater.

Some frogs, such as the Wood frog (Lithobates sylvaticus) very strongly prefer to breed in “vernal pools“, sometimes called “ephemeral pools.”

Vernal pools are temporal pools of water that form in the spring. They are formed when depressions on the ground are filled with water from melting snow and falling rain.

They are typically small and shallow, and unlike a pond or lake, they have no permanent source of water. This means they dry up in the summer.

Since they are temporal, they do not have fish or many other aquatic predators that could eat the eggs before they hatch.

This makes them ideal breeding sites for frogs, toads, and many other amphibians.

The Differences Between Frog Eggs and Toad Eggs

Many frog and toad species lay eggs in the same pools, and their eggs can be difficult for the untrained eye to tell apart.

1. Appearance

The easiest way to tell Frog eggs and toad eggs apart is by their appearance.

Most frogs lay their gelatinous eggs in large masses, or clusters, and attach them to submerged vegetation or debris, just below the surface of the water – to keep them from floating away. These egg clusters may look somewhat similar to clusters of grapes.

The eggs look like clusters of jelly globs, with a developing embryo visible inside each egg.

On the other hand, most toads lay their eggs in long gelatinous strands, which may look almost like strings of black beads, or jelly-coated necklaces.

The egg strings wrap around vegetation or lie at the bottom of the water.

No North American frog, European frog, or Australian frog species lay their eggs in strings.

If you live in North America, Europe, or Australia and see amphibian eggs laid in long strings in the water, you can be sure they are toad eggs.

2. Toxins

All true toads toads (of the family Bufonidae) produce toxins as a defense against predators.

These toxins are present not only in Adult toads but at every stage of a toad’s lifecycle. This means the eggs (and tadpoles) of many toad species are poisonous to varying degrees.

On the other hand, the eggs of most frog species do not have any toxins and are not poisonous.

Not All Frogs or Toads Lay Their Eggs the Same Way

Although most frog species lay their eggs in clusters, and most toad species lay their eggs in strings, it is important to note that some frogs, or toads lay their eggs differently.

A few toad species, such as the red-spotted toad (Anaxyrus punctatus) lay their eggs singly. The small eggs may adhere to each other and form small clusters on the pond’s bottom.

Oak toads (Anaxyrus quercicus) lay their eggs singly or in small strands of up to six to eight eggs, either free-floating or attached to vegetation.

Some frog species, such as the Spring peeper (Pseudacris crucifer) lay their eggs singly or in clumps of two or three.

The eggs are attached to submerged vegetation or debris, just below the surface of the water.

Identifying Frog Eggs

A good way to tell frog and toad eggs apart is to learn how to identify the eggs of individual frog and toad species.

Here’s how you can identify the eggs of 6 frog species:

1. Wood Frog (Lithobates sylvaticus)

Wood frog lay their eggs in clusters, attached to twigs or vegetation, just below the surface of the water.

If the pool has lots of emergent vegetation, eggs are often laid in open areas that receive lots of sunlight.

Freshly laid wood frog egg masses are dense and are roughly the size of a golf ball.

Over time, the eggs absorb water and swell to their true size, which is usually roughly the size of a softball.

• Each Wood frog egg mass can have anywhere from 500, to as many as 2,000 eggs.

A single Wood frog can lay 1,000, to 3,000 eggs in a breeding season.

The embryos in the eggs are black on top and white on the bottom, but as the embryos develop into tadpoles, the white is lost.

Wood frogs often lay their egg masses communally, so it’s common to find large rafts of wood frog egg masses, containing many layers of masses on top of one another.

Over a short time, wood frog egg masses may become colonized by symbiotic algae, giving them a greenish coloration.

The eggs hatch in 9 to 30 days, depending on the ambient temperatures.

2. Northern Leopard Frog (Lithobates pipiens)

Like wood frogs, Leopard frogs lay their eggs masses are laid in areas of the pool that receive lots of sunlight.

Leopard frog egg masses are typically firm and globular and are about the same size as those of the Wood frog.

The only difference is that they are much denser (more tightly packed) and contain more eggs – usually 2,000-3,000 eggs per egg mass, but a single egg mass can have up to 6,500 eggs.

In addition, the layer of clear jelly that surrounds the yolk is much thinner than in wood frog eggs.

Since the egg masses are more tightly packed, the layer of clear jelly that surrounds each embryo is much thinner than in Wood frog eggs.

This results in individual Leopard frog eggs being much smaller than those of the Wood frog.

Since Leopard frog eggs have a very thin layer of jelly, they do not appear as clear as Wood frog eggs. Rather, they are black on top and white on the bottom.

Northern leopard frog eggs take about 7 to 17 days to hatch, depending on the ambient temperatures.

3. Gray Tree Frog (Dryophytes versicolor)

Gray tree frogs lay their eggs in small packets of 10 – 40 eggs on the surface of the water.

A single Gray tree frog can lay 1,000 to as many as 2,000 eggs in a breeding season.

Oftentimes, the egg masses are generally really close to, or loosely attached to debris, branches, or emergent vegetation

Each egg is dark brown on the top and a yellowish cream color on the bottom, and is surrounded by a protective gelatinous mass.

As the embryos develop, Gray tree egg masses will deteriorate and flatten to the point where individual eggs are no longer identifiable from the rest of the floating raft.

Gray tree frog eggs take about 3 to 7 days to hatch, depending on the ambient temperatures.

4. American Bullfrog (Lithobates catesbeianus)

Unlike most frogs, American bullfrogs do not lay eggs in tight masses. Rather, their eggs are laid in a loose mass draped on underwater plants, slightly below the water’s surface.

After about a day, the egg cluster floats to the water surface and flattens out into a giant thin sheet, only about one or two eggs thick.

Each egg mass can have anywhere from 12,000, to as many as 20,000 eggs.

The eggs take about 3 to 5 days to hatch, depending on the ambient temperatures.

5. Spring Peeper (Pseudacris crucifer)

Unlike many frogs which lay their eggs in masses, Spring peepers lay their eggs singly or in clumps of two or three.

The eggs are attached to submerged vegetation or debris, just below the surface of the water.

A single Spring peeper can lay anywhere from 900 to 1,000 eggs each breeding season.

Spring peeper eggs are very small and can be hard to see when laid singly.

Each egg has a yellowish-cream color and is surrounded by a protective gelatinous mass.

The eggs take about 4 to 15 days to hatch, depending on the ambient temperatures.

6. European Common Frog (Rana temporaria)

European common frogs lay their eggs in clusters, attached to twigs or vegetation, just below the surface of the water.

Each egg mass can have 500, to as many as 2,000 eggs.

Individual eggs are black and have black embryos (that appear as black dots at the center), surrounded by a clear jelly capsule about 1 cm across.

The eggs take about 14 to 28 days to hatch, depending on the ambient temperatures.

Deposit ‘rafts’ of spawn, often containing up to 2000 eggs. Each small black egg is surrounded by a clear jelly capsule around 1 cm across.

Identifying Frog Eggs

Here is how you can identify the eggs of 6 toad species:

1. American Toad (Anaxyrus americanus)

American toads their eggs in jelly-like strings, that attach to vegetation or lie at the bottom of the water.

A single American toad lays between 4,000 and 8,000 eggs, in two long parallel strands.

Each egg has a black embryo at the center surrounded by a clear jelly and measures about 1.5 mm in diameter.

Sometimes, the egg strings coil up like an old phone cord.

Over time, sediment may settle on the egg strands, covering individual eggs and making the strands look like giant worms.

2. Fowler’s Toad (Anaxyrus fowleri)

Fowler’s toad eggs look very nearly identical to those of the American toad.

The main distinction between the two is;

• The eggs of the American toad have a double envelope surrounding the eggs, with the individual eggs separated by partitions
• The eggs of the Fowler’s toad have a single membrane, and the individual eggs are not separated by partitions.

Apart from this distinction, the eggs of these two toad species are virtually identical

A single Fowler’s toad can lay anywhere from 2,000 to as many as 10, 0000 eggs in a single breeding season.

The eggs take about 2 to 7 days to hatch, depending on the ambient temperatures.

3. Western Toad (Anaxyrus boreas)

Western toad’s egg strands are usually two eggs wide but are sometimes three eggs wide.

A single egg strand can be up to 60 feet long and contain as many as 7,000 eggs, with the eggs spaced roughly 13 to 52 eggs per inch.

The individual eggs are black on top, and white at the bottom and are surrounded by two layers of jelly.

Each egg is fairly small, only measuring about 1.5 to 1.8 mm in diameter.

The eggs take about 3 to 12 days to hatch, depending on the ambient temperatures.

4. Cane Toad (Rhinella marina)

Like most toads, Cane toads lay their eggs in in long double strands of clear jelly, that wrap around aquatic vegetation.

The embryos appear as black dots in the center of the eggs.

A single Cane toad can lay anywhere from 10,000 to as many as 30,000 eggs in a breeding season and may lay up to 2 clutches per year.

The eggs take about 2 to 3 days to hatch, depending on ambient temperatures.

5. European Common Toad (Bufo bufo)

Like most toads, Common toads lay their eggs in long double strands of jelly.

Each egg strand is very long and may contain as many as 1,500 eggs. The embryos are black and look like dots at the center of each egg.

A single Common toad can lay anywhere from 1,000 to as many as 5,000 eggs each breeding season.

The eggs take about 10 to 30 days to hatch, depending on the ambient temperatures.

6. Red-spotted Toad (Anaxyrus punctatus)

Unlike most toads which lay their eggs in strands, Red-spotted toad lay their eggs singly.

The eggs are often laid on the bottom of shallow rock-lined pools, and they are sometimes found in muddy bottoms of shallow temporary ponds.

When lad, the small eggs may adhere to each other and form small clusters on the pond’s bottom.

The eggs take about 2 to 3 days to hatch, depending on the ambient temperatures.

Common Questions About Frog Eggs and Toad Eggs

What is the difference between Cane toad eggs and Frog eggs? Cane toad eggs are laid in long gelatinous strands and look almost like black beads encased in jelly. On the other hand, most frogs lay their eggs in globular clusters or masses – and never in strands.

What is the difference between Common frog eggs and Common toad eggs? Common frogs lay their eggs in large clusters, while common toads lay their eggs in parallel gelatinous strands. Common frog eggs may look almost like a cluster of grapes, while common toad eggs may look like a long jelly-covered necklace.

Sources:

The life cycle of a North American toad. Encyclopædia Britannica. https://www.britannica.com/video/22455/life-cycle-toad-North-American

Stokeo, W. J. (1980). The Observer’s Book of British Wild Animals. Frederick Warne

Stebbins, Robert C. (1951). Amphibians of western North America. University of California Press

Wright, A. 1932. Life Histories of the Frogs of Okefinokee Swamp, Georgia: North American Salientia (Anura) No. 2. United States: Cornell University Press.

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

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The post Frog Eggs vs Toad Eggs: Key Differences You Should Know! first appeared on Snake Informer.

Like most toads, American toads reproduce by laying eggs. The eggs are laid in jelly-like strings, along plants, or on the bottoms of shallow water in ponds.

Learning about American toad eggs is great to add to your knowledge and feed your curiosity. Read on to find out everything you need to know about American toad eggs including some really interesting facts, as well as how to easily identify them.

When Do American Toads Lay Their Eggs?

The breeding season of American toads is triggered by the arrival of warmer temperatures and longer days.

In most of their range, this is from March to July, depending on the latitude.

However, American toads in the Southeast may begin breeding as early as mid-January or February.

American toads often breed earlier than other toads.

Where Do American Toads Lay Their Eggs?

American toads prefer to lay their eggs in shallow, standing, or slow-moving, temporary, or semi-permanent freshwater bodies with little to moderate amounts of vegetation.

Breeding sites include woodland ponds, flooded fields, seasonal pools, temporary rain puddles, flooded ditches, lake edges, river backwaters, open marshes, swamps, artificial ponds, and even deep tire tracks or potholes filled with rainwater.

Like many other amphibians, American toads prefer to breed in waters that are free of predatory fish. They will typically avoid water with fish, as fish often prey on amphibian eggs and larvae.

How Do American Toads Lay Their Eggs?

The males arrive first at the breeding sites and call for mates, usually beginning in the early evening. They will also call during the daytime on warm and humid days at the height of the breeding season.

Females appear at the breeding sites from a few days to one week after the males.

Once at the breeding sites, female American toads will choose their mates depending on individual characteristics of the males’ calls – and head towards the calls of particular males.

The male then grasps her behind her forelimbs in a tight mating embrace called ‘amplexus’.

Once in the amplexus embrace, the pair will swim around as the female chooses a site to lay her eggs. The female then lays her eggs in jelly-like strings, and the male releases sperm into the water, to fertilize the eggs as the female lays them.

The egg strings attach to vegetation or lie at the bottom of the water.

How Many Eggs Do American Toads Lay?

A single female American toad can lay anywhere from 2,000 to as many as 20,000 eggs at a time.

In many toad species, female fecundity (capability to produce offspring) is positively correlated with size, so large female American toads may lay more eggs than smaller females.

Why Do American Toads Lay So Many Eggs?

Like many other toads (and frogs), American toads lay large numbers of eggs as a natural way to counter the extremely high mortality rates they experience in their early life stages.

American toads leave their eggs shortly after laying them. This means the eggs (and tadpoles) are vulnerable to predators, and environmental conditions – leading to very low survival rates.

Of the tadpoles that hatch, there will be intense competition for food and limited resources, meaning again the number of tadpoles will naturally thin out.

When the toadlets leave the water, only a few will live to adulthood and reproduce. The rest will get eaten by predators such as snakes, raccoons, and a wide variety of birds.

What Do American Toad Eggs Look Like?

American toad eggs are black and surrounded by a clear jelly. They are laid in double, gelatinous strands and look almost like jelly-coated necklaces.

Here is what American toad eggs look like:

When first laid, the eggs are very tightly packed together. Over time, the jelly surrounding the eggs absorbs water until each egg is covered with a thick jelly coating.

This enables the eggs to float near the surface of the water, where it is warmer and there is more oxygen.

Sometimes, the egg strings coil up like an old phone cord.  The jelly strings help anchor the eggs to rocks and vegetation underwater, to prevent them from washing away.

Over time, sediment may settle on the egg strands, covering individual eggs and making the strands look like giant worms.

How Long Do American Toads Take To Hatch?

American toad eggs take about 3 to 14 days to hatch, depending on the environmental conditions. The eggs will typically develop and hatch faster in warmer temperatures and slower in colder temperatures.

American toad eggs laid in cooler weather will usually take longer to hatch than those laid in warmer weather.

What Do American Toad Tadpoles Look Like?

American Toad tadpoles are small, ranging from 0.7 to 1 inch (18 to 27mm) in length. They have a blackish-brown coloration, with a clear fin tail.

Young American toad tadpoles can easily be recognized by their skinny tails in relation to the size of their bodies.

They can often be seen swimming close together in schools in the shallow parts of their pond.

American Toad Eggs vs Frog Eggs

American toads and many frog species often lay eggs in the same pools.

However, distinguishing American toad eggs from frog eggs is fairly easy.

Most frogs lay their eggs in large clusters. The eggs look like jelly-like globs, with a developing embryo visible inside each egg.

Some frogs also lay their eggs singly, often attached to the same stick in a pool.

On the other hand, American toads (and most other toads) lay their eggs in long jelly-covered strings, which may look like a string of black beads. No North American frog or European frog species lay their eggs in strings.

If you live in North America, Europe, or Australia and see amphibian eggs laid in long strings in the water, you can be 100% sure they are toad eggs.

Once you are sure they are toad eggs, you can ID them to see whether or not they belong to American toads.

What Animals Prey on American Toad Eggs and Tadpoles?

Like the eggs of many toad species, American toad eggs are toxic, and are therefore avoided by many potential predators.

American toad tadpoles also exude a toxic substance that is poisonous to at least some of their potential predators. However, they are still preyed on by

• Larvae of predaceous diving beetles (Dytiscidae)
• Newts (Notophthalmus)
• Dragonfly naiads
• Giant water bugs
• Crayfish
• Some birds such as Least sandpipers

What to Do if You Find American Toad Eggs

If you live near a wooded area, especially near a pond, or another water body there’s a chance of encountering American toad eggs in the spring. If this happens, be sure to avoid disturbing the eggs.

Disturbing or removing the eggs from the water could damage them, or even kill the tiny embryos developing inside the eggs.

If you find American toad eggs out of the water, it is best to leave them alone, especially if they are very near the water.

However, if you find toad eggs that were disturbed (by a human or animal) and taken out of the water, you could try to put them back in the water.

If the egg mass is still attached to a stick, very gently put the stick back in the water (just a few inches below the surface).

Still, the eggs are not guaranteed to hatch because the disturbance may have damaged them or killed the embryos developing inside.

Of course, there’s no harm in observing toad eggs from a distance.

Featured image credit: Olivia Gaetz (CC BY-NC 4.0 DEED)

Sources:

BRUCE WALDMAN, JOHN E. RICE, RODNEY L. HONEYCUTT, Kin Recognition and Incest Avoidance in Toads, American Zoologist, Volume 32, Issue 1, February 1992, Pages 18–30, https://doi.org/10.1093/icb/32.1.18

Stebbins, Robert C. (1951). Amphibians of western North America. University of California Press

Gerhardt, H.C. Sound pressure levels and radiation patterns of the vocalizations of some North American frogs and toads. J. Comp. Physiol. 102, 1–12 (1975). https://doi.org/10.1007/BF00657481

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

snakeinformer.com

The post Everything You Need To Know About American Toad Eggs first appeared on Snake Informer.

Frog tadpoles tend to be longer and slimmer than toad tadpoles, which tend to be short and chunky. Apart from these differences, frog and toad tadpoles can be difficult to tell apart. They have more similarities than they have differences.

The easiest way of distinguishing frog and toad tadpoles is to learn how to visually identify the tadpoles of different frog and toad species.

Another good way to ID tadpoles is based on when the adults are breeding. If you find tadpoles outside of the breeding season of a particular frog or toad species, you can rule that species out.

What Frog and Toad Tadpoles Have In Common

Tadpoles are very different from adult frogs and toads; this is because they’re adapted for a fully aquatic life, while adult frogs and toads are adapted for a semi-aquatic, or mostly terrestrial life (depending on the species).

When first hatched, both frog and toad tadpoles tadpoles have visible external gills, often in pairs, on either side of their heads. They use these gills to breathe in the water, just like fish.

They have no limbs and swim through water via undulating movements of a long boneless tail fin. Like fish, tadpoles have a lateral line organ, which runs along each side of their body and tail, through which they sense movements in water.

When tadpoles reach the midway point of their development, opercular folds grow backward from the hyoid arch of each side covering the external gills and gill slits.

In this way, a gill cover known as an “operculum” is formed enclosing the external gills and gill slits – turning the external gills into internal gills. These internal gills are vented by ventrolateral openings, known as spiracles.

Depending on the species, there can be:

• Two spiracles on both sides of the body,
• A single spiracle on the underside near the vent, or
• A single spiracle on the left side of the body

Spiracles are tubular structures leading out of the opercular chamber. Tadpoles eject water through the nostrils and through the spiracles.

Internal Anatomy

Both frog and toad tadpoles primarily feed on algae and detritus in their early stages. Due to this mostly herbivorous diet, both frog and toad tadpoles have very long tightly coiled intestines, that make up more than half of their body mass.

Plants contain cellulose, a compound that is very hard to digest. Because of this, plant matter needs to spend more time in the digestive system. This long intestinal tract gives tadpoles more time to break down the plant matter and absorb as many nutrients as possible.

The intestine takes up about half the space within the tadpole’s body and can be more than ten times longer than the tadpole itself.

It is also its largest organ and is visible through the translucent belly skin in many tadpole species.

The Differences Between Frog and Toad Tadpoles

Frogs and toads often lay eggs in the same water bodies. While toad eggs are fairly easy to differentiate from frog eggs (toads typically lay eggs in strings while frogs typically lay eggs in masses), this is not the case with the tadpoles.

Frog tadpoles often look very similar to toad tadpoles and can be very difficult for the average person to tell apart. However, there are often a few differences between the two.

• Toad tadpoles tend to be short and chunky while frog tadpoles tend to be longer and slimmer (not always)
• Toad tadpoles tend to have bulky heads, while frog tadpoles have smaller heads (again, not always)

The differences between frog and toad tadpoles can be compared to those of adult frogs and toads – toads are often shorter and chunkier than frogs.

Apart from these differences, frog and toad tadpoles can be difficult to tell apart. They have more similarities than they have differences.

For this reason, the most effective way to distinguish frog and toad tadpoles is to look at mouth parts and teeth rows, since these features are often different in tadpoles of different species.

However, since most people will not be able to do this,  an easier way to distinguish tadpoles is to learn how to visually identify the tadpoles of different frog and toad species.

As earlier mentioned, you could also ID tadpoles based on when the adults are breeding. 

How to Identify the Tadpoles of 12 Frog Species

As mentioned above, a good way to tell frog and toad tadpoles apart is to learn how to identify the tadpoles of individual frog and toad species.

Here’s how you can identify the tadpoles of 12 frog species:

1. Wood Frog (Lithobates sylvaticus)

Wood frogs are fairly small frogs found in the northeastern quarter of the United States and throughout most of Canada to central and southern Alaska.

Wood frogs generally lay their eggs in the springtime from March through May, depending on the latitude.

When they first hatch, wood frog tadpoles are very dark in color and about .25 inches long. As they grow, the dorsal color becomes brown and the venter develops gold flecking, giving them a more mottled appearance.

Wood frog tadpoles often school in shallow areas of the pool or float near the surface. Doing this allows them to absorb solar heat, in the relatively cool waters of a vernal pool.

2. Spring Peeper (Pseudacris crucifer)

Spring peepers are small, slender tree frogs found throughout much of the eastern part of North America.

They generally lay their eggs in the spring from late March to early May.

Young spring peeper tadpoles are tan/brown with darker mottling and the tail fin is clear. As the tadpoles age, they gain golden or brassy flecking on the body and large dark blotches along the edges of the tail fins.

The tadpoles typically grow to 3 to 4 cm in total length before metamorphosis.

3. American Bullfrog (Lithobates catesbeianus)

American bullfrogs are the largest frogs found in North America. They can grow to a length of 8 inches or more and weigh up to 1.5 pounds!

American bullfrogs can be found from Nova Scotia, Canada, throughout the continental United States, and as far south as Mexico and Cuba.

Due to this wide distribution, these frogs generally breed at slightly different times of the year, depending on location. In general, they breed from May to July in the north, and February to October in the southern part of their range.

Young American bullfrog tadpoles are black with gold blotches and relatively short tails. As they grow, they develop an olive-green coloration with distinct inky black specks over the dorsal surface.

The tadpoles can grow up to 6 inches in length before metamorphosis.

4. Green Frog (Lithobates clamitans)

Green frogs are medium-sized frogs (3 – 5 inches in length) found throughout much of the eastern United States as well as southeastern areas of Canada.

They generally breed from April to July but may continue breeding until September in southern portions of their range.

Green frog tadpoles are typically green with small black dots on the dorsal side of their bodies, with tails that are dark green or brown with dark spots. Their bellies are white or cream.

Unlike the tadpoles of most frog species, green frog tadpoles do not have translucent belly skin, and the intestinal coil is not visible.

They can grow 3 – 4 inches in length before metamorphosis in length with a body-to-tail ratio of 1:1.8.

5. Northern Leopard Frog (Lithobates pipiens)

Northern Leopard frogs are small frogs found across much of the Northern part of North America.

They generally breed between March and June.

Leopard frog tadpoles range from light to dark brown or green with small, gold spots and bronze bellies. They have long tails the tail crests are usually a lighter color than the belly.

An easy way to distinguish leopard frog tadpoles from those of other frog or toad species is:

• They have dorsal rather than lateral eyes and a white stripe between their nostrils.

6. Pickerel Frog (Lithobates palustris)

Pickerel frogs are medium-sized frogs found throughout much of the eastern United States and parts of southeastern Canada. These frogs are unique in that they are the only poisonous frogs native to the United States.

Pickerel frogs generally breed in the spring from late March to early May.

Their tadpoles resemble those of leopard frogs; they are greenish in color, with black dots covering the body and tail. The tail crests are clouded, and the underside is cream-colored

Pickerel frog tadpoles can grow 7.6cm before metamorphosis.

Distinguishing between the tadpoles of pickerel frogs and leopard frogs is extremely difficult based on appearance alone. They can only be effectively distinguished by examining their tooth ridges.

7. Gray Tree Frog (Dryophytes versicolor)

Gray tree frogs are fairly large tree frogs (1– 2 inches in length) native to much of the eastern United States and southeastern Canada. Despite their name, not all gray tree frogs are actually gray.

They vary in coloration from mottled gray or brownish-gray to light green – and they can change color depending on their environment.

Gray tree frogs generally breed in the spring from late April to early August.

Gray tree frog tadpoles have inconsistent coloring, which may include different shades of brown or olive green. The body and tail are patterned with many specks of black and gold – and black blotches may be present around the edge of the tail.

Interestingly, gray tree frog tadpoles can develop a bright red coloration on their tail when they are exposed to predators such as dragonfly larvae.

8. Green Tree Frog (Hyla cinerea)

American green tree frogs are small, smooth-skinned frogs found in the central and southeastern United States, from eastern Virginia down to Florida and as far west as Texas.

They generally breed from March to September.

Green tree frog tadpoles have continuous ontogenetic color changes until they reach stages 25 or 26 of their development. At this point, the tadpoles have a green body and a yellow underside.

The tail may have distinct yellow orbitonasal stripes, and dark mottling or reticulations.

9. European Common Frog (Rana temporaria)

European common, sometimes called common frogs are found throughout most of Europe, except for a few regions.

They generally breed in the spring from March to late June.

Common frog tadpoles are plain black when they hatch but change to a mottled golden brown as they age. This distinguishes them from the plain black common toad (Bufo bufo) tadpoles found in similar habitats.

10. Marsh Frog (Pelophylax ridibundus)

Marsh frogs are Europe’s largest native frogs and are found across Europe and east into Asia. They were introduced to the United Kingdom in the 1930s, and can now be found throughout the southeast of England

They generally breed in the spring, from March, and may continue breeding into the summer.

Marsh frog tadpoles have an olive-green to brownish coloration with small black dots, and cream-to-yellow belies.

11. Northern Red-legged frog (Rana aurora)

Northern red-legged frogs are medium-sized frogs found along the Pacific coast, west of the Coast and Cascade Mountains from southwestern British Columbia to northern California.

They generally breed in late winter and early spring from January to March.

Northern red-legged frog tadpoles are dark brown when they first hatch, and have a light gold line along the side of the body. However, when seen from a distance, they usually appear black.

They have oval bodies, long tails, and short gills.

As the tadpoles grow, their body color lightens, giving them a tan to dark brown color with scattered clumps of golden flecks. The gold line along the side of the body also disappears.

Northern red-legged frog tadpoles grow to 2 to 3 inches in total length before metamorphosis.

12. Pacific Tree Frog (Pseudacris regilla)

Pacific tree frogs also known as Pacific chorus frogs, are fairly small frogs found on the west coast of North America.

These frogs generally breed in January to mid-May.

Pacific tree frog tadpoles have a brown or olive coloration, usually with black speckling. The underside is whitish.

The tail fin has a high arch that starts mid-way along the back and is rounded at the tip.

When viewed from above, pacific tree frog tadpoles have eyes located on the margins of the head. The eyes, especially in large tadpoles, stick out from the outline of the head.

The tadpoles grow to about 2 inches total length before metamorphosis

How to Identify the Tadpoles of 12 Toad Species

Toad tadpoles are often similar to the tadpoles of many frog species. However, they can be distinguished from frog tadpoles by their appearance, and other characteristics.

Here’s how you can identify the tadpoles of 12 toad species:

1. American Toad (Anaxyrus americanus)

American toads are the most broadly distributed species of true toads (Bufonidae) in North America. They can be found in most areas of eastern Canada and the United States.

They generally breed in the spring, from March through July.

American Toad tadpoles are small, ranging from 0.7 to 1 inch in length. They have a blackish-brown coloration, with a clear fin tail.

Young American toad tadpoles can easily be recognized by their skinny tails in relation to the size of their bodies.

2. Fowler’s Toad (Anaxyrus fowleri)

Fowler’s toads are found throughout much of the eastern US, and parts of southeastern Canada.

They generally breed in the spring, from late April to late June.

Fowler’s toad tadpoles range in from 0.4 – 1 inch in length and have dorsal eyes and blunt snouts.

Newly hatched tadpoles appear solid black. However, as they grow, the tadpoles develop a dark brown coloration with light spots on the body and tail.

Fowler’s toad tadpoles can be recognized by their dark tail musculature (which may be lighter on the lower half), and transparent tail fins. The tail fins may sometimes have light specks.

3. Southern Toad (Anaxyrus terrestris)

Southern toads are found mainly in the southeastern United States, from southern Virginia to Florida and west into Louisiana.

These toads breed from March, through October.

Southern toad tadpoles have a mottled black and gold to green coloration and often have small purplish dots on the dorsal surface.

The underside is also blackish with somewhat purplish, scattered spots

The upper tail fin is faintly spotted, but the lower tail fin is not.

Southern toad tadpoles can grow to about 1 inch in length before metamorphosis but are usually smaller.

4. Western Toad (Anaxyrus boreas)

Western toads are found in much of the western parts of North America, from southern Alaska to northern Baja California, Mexico.

They generally breed from February to July.

Western toad tadpoles are black with a clouded tail fin that lacks patterning – when they first hatch.

As they age, they develop a dark brown coloration and varying degrees of fine lighter flecking on the body.

The tail musculature is dark, and the fins are slightly pigmented with the dorsal fin darker than the ventral

Western toad tadpoles have an underside that is slightly paler than the dorsal surface. The fine lighter flecking on older tadpoles gives them a fine golden shimmer over the belly when viewed in bright light.

They can grow to about 1 inch in length before metamorphosis.

5. Woodhouse’s Toad (Anaxyrus woodhousii)

Woodhouse’s toads can be found throughout much of the central and western United States.

They generally breed from March to July.

Woodhouse’s toad tadpoles can be difficult to distinguish from those of the western toad.

They are small (less than one inch in total length), darkly pigmented, and may be covered in small metallic gold flecks. The tail fin is clear and rounded at the tip.

Since the tadpoles of both western and Woodhouse’s toad species are similar, an easy way to distinguish them is: Woodhouse’s toad tadpoles have patches of white and gold pigment on the body and the underside of the tail musculature and the tail fin lacks pigment except for some dark flecking.

Western toad tadpoles, on the other hand, appear uniformly black (fine gold pigmentation on the belly is visible in bright light), the dorsal fin is moderately pigmented, and the ventral fin has little or no pigmentation.

6. European Common Toad (Bufo bufo)

Common toads, sometimes called European common toads are one of the most populous species of amphibians in Europe.

They can be found throughout most of Europe – only absent from Ireland, several Mediterranean islands, and Iceland.

Common toads breed in the spring, from April to July.

Their tadpoles are uniformly blackish in color, and have a gray underside – and often shoal together, like fish.

Common toad tadpoles can be distinguished from the tadpoles of other toad or frog species by the fact that the mouth is the same width as the space between the eyes.

This is twice as large as the distance between the nostrils.

7. Natterjack Toad (Epidalea calamita)

Natterjack toads can be found in the sandy and heathland areas of Europe.

They breed between the end of April and July.

Natterjack toad tadpoles appear similar to those of the common toad. However, they are slightly smaller than common toad tadpoles.

They also have a more rounded snout and bask around the edges of pools but tend not to shoal.

As they begin to develop back legs, a small, white spot may be visible on their chin, growing into a large patch as they develop.

8. Cane Toad (Rhinella marina)

Cane toads (also called marine toads) are native to South and Central America. But they have also been introduced to other countries where they aren’t native, such as Australia, where they have become a significant pest species.

They are also found in areas of Central and South Florida, including Key West and Stock Island, and in an isolated population in Bay County in the panhandle.

Depending on their habitat, Cane toads can breed year-round, following heavy rains.

Cane toad tadpoles have a shiny black coloration on top and a plain dark bluish-grey or black belly.

They have black musculature surrounded by clear tail fins, which makes their tails appear quite slim. The tail is usually one and a half times the length of the body.

Cane toad tadpoles are small, and only grow to 30mm in length, with the body about 11mm long at most.

9. Yosemite Toad (Anaxyrus canorus)

Yosemite toads are found in a small area of the Sierra Nevada Mountains in California and have never been found outside of California.

They breed from May to July.

Yosemite toad tadpoles are small, growing about 0.39–1.46 inches (10–37 millimeters) in length.

They have a jet-black coloration, and unlike many other tadpoles, their intestines are not visible ventrally.

Yosemite toad tadpoles have their eyes set dorsally, which is in contrast to the tadpoles of the Sierran chorus frog (which occurs in the same range) – which have eyes on the top of their head.

Yosemite toad tadpoles can be easily confused with those of the western toad.

However, in contrast to the western toad, the snout is shorter and blunted in lateral view, the tail fins are mostly opaque, the tail is deepest about halfway down its length, and the tail tip is more rounded.

10. Colorado River Toad (Incilius alvarius)

Colorado River toads (also called Sonoran desert toads) are found in and around the Sonoran Desert in California and Arizona south to Mexico.

They breed from May to July.

Colorado River toad tadpoles have a gray or golden brown coloration, which makes them strikingly different from those of related species such as the western toad (Anaxyrus boreas), or Yosemite Toad (Anaxyrus canorus).

11. Red-spotted Toad (Anaxyrus punctatus)

Red-spotted toads can be found throughout the southwestern United States, from parts of southern California to the Central Plains.

They generally breed from March to September.

Red-spotted toad tadpoles have a black or dark brown coloration, with metallic bronze flecks.

They grow to about 1.5 inches ( 3.8cm) before they go through metamorphosis.

12. Oak Toad (Anaxyrus quercicus)

Oak toads can be found in the coastal regions of the southeastern United States, from eastern Louisiana to southeast Virginia and south throughout Florida.

They are the smallest species of toad native to North America, with an adult length of 0.75 to 1.30 inches (19 to 33 mm).

Oak toad tadpoles have a grayish-olive or grape-green coloration on top and a purplish underside. The tail has 6 or 7 black saddle marks.

They grow to a length of 0.71 to 0.76 inches (18 to 19.4 mm) before metamorphosis.

Sources:

Altig, Ronald & Whiles, Matt & TAYLOR, CINDY. (2007). What do tadpoles really eat? Assessing the trophic status of an understudied and imperilled group of consumers in freshwater habitats. Freshwater Biology. 52. 386 – 395. 10.1111/j.1365-2427.2006.01694.x.

Stokeo, W. J. (1980). The Observer’s Book of British Wild Animals. Frederick Warne

Stebbins, Robert C. (1951). Amphibians of western North America. University of California Press

Wright, A. 1932. Life Histories of the Frogs of Okefinokee Swamp, Georgia: North American Salientia (Anura) No. 2. United States: Cornell University Press.

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

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The post Frog Tadpoles vs Toad Tadpoles: How They Really Differ! first appeared on Snake Informer.

Toads do not drink water through their mouths like we do. Instead, they rehydrate by absorbing water across their permeable skin, in a process known as ‘cutaneous absorption’. 

All true Toads in the genus Bufo have a highly vascularized area of skin located in the ventral pelvic region known as a ‘drink patch’ or seat patch – which is responsible for as much as 70 percent of their total water uptake.

Do Toads Drink Water?

Like all animals, toads need to consume water to survive. Dehydration can be harmful, and even potentially lethal to most toads. Their need for water is as critical as their need for food or oxygen–it’s an essential substance, that keeps their bodies working normally.

Toads’ bodies need a steady supply of fluids to transport nutrients, eliminate waste, and perform many other important functions.

As earlier mentioned, toads generally acquire water by absorption across their skin rather than by oral drinking.

Amphibians have unique skin compared to that of many other vertebrates. Their skin is composed of thin membranous tissue that is quite permeable to water and contains a large network of blood vessels.

This permeable skin distinguishes them from mammals, birds, or reptiles.

Permeability relates to how easily a gas or liquid molecule can pass back and forth from the environment into the animal and vice versa.

Typically, the larger the molecule, the more difficult it is to enter the animal through its skin. Amphibian skin is more permeable than that of other vertebrates.

Their membranous skin allows water and respiratory gases to readily diffuse directly down their gradients between the blood vessels and the surroundings.

Many toads are even known to rehydrate by absorbing moisture from moist soil, through their skin.

How Do Frogs Drink Water?

Although most of a toad’s skin is permeable to water, all toads in the genus Bufo have a highly vascularized area of skin on their belly and the underside of their thighs (the ventral pelvic region), known as the ‘drink patch’, ‘drinking patch’, or the ‘seat patch’. This area of skin is responsible for most of their water uptake.

The drink patch has a very large network of small blood vessels called capillaries. Water absorption across this skin is driven by the osmotic gradient that develops as a consequence of solute transport.

In simple words, the skin acts in concert with the kidney and urinary bladder to maintain fluid balance

During periods of rehydration, toads adopt a posture known as “water absorption response” (WR) – in which they thrust their hindlimbs backward and press the belly surface onto any surface containing water.

Even though the drink patch skin only constitutes about ten percent of the total skin area, it is responsible for over 70 percent of the total water uptake by many dehydrated toads.

Do Toads Feel Thirsty?

In mammals, thirst motivates water seeking and consumption. It involves the stimulation of the thirst center in the hypothalamus as a result of a decrease in the volume of the extracellular fluids.

Some amphibians appear to seek water in which to lie in order to rehydrate.

This has led some researchers to suggest that this process may constitute a ‘primeval thirst’, which is quenched by the absorption of water across the skin, instead of by oral drinking.

What Sources Do Toads Use to Rehydrate?

Toads can rehydrate by absorbing water from direct water sources, as well as indirect water sources.

1. Direct Water Sources

Although toads are generally not as strong of swimmers as aquatic frogs are, all toads can swim.

Toads often seek out shallow bodies of fresh water in which they can soak and lie – to rehydrate.

In rainy weather, it’s common for toads to come of out their retreats, and soak in rain puddles on the ground. While they soak in water, they absorb some of the water through their skin and rehydrate.

Many toads also rehydrate by absorbing dew droplets condensed on grass or other surfaces.

2. Indirect Water Sources

Apart from using direct water sources, toads also rehydrate by absorbing moisture from moist soil, or any other moist material, such as damp leaf litter.

Toads can absorb moisture through their skin even when they are underground. This is especially useful because they spend a lot of their time tunneled under the soil to escape the drying heat of the sun.

Toads that live in very humid environments can also hydrate by absorbing the moisture in the air as it condenses on their skin. This is especially true at night when the temperatures are cooler.

Below is a table that shows the water sources that toads use to rehydrate:

Toads Occasionally Swallow Small Quantities of Water

Although frogs and toads generally do not orally drink water to rehydrate, many frogs and toads are known to occasionally swallow small quantities of water. This can happen when they submerge their heads in water.

In one study, northern leopard frogs (Lithobates pipiens) were dehydrated until they had lost water equivalent to about 30% of their body weight.

When placed in tap water, the frogs rapidly regained this lost water, and 1·4% of the total water uptake was taken up by drinking.

In the same study, African clawed frogs (Xenopus laevis), were also dehydrated until they lost water equivalent to about 26% of their body weight.

When placed in fresh water, they regained their lost weight very slowly and after 2 hours in tap water, had only reaccumulated one-fifth of the water which they lost – with drinking making up 8% of the total water uptake.

According to the same study, this drinking was not in response to dehydration (primary drinking), but appeared to constitute ‘secondary’ drinking, which was not directly related to osmotic need.

Little scientific research has been done on this topic, and it’s not clear why some frogs and toads occasionally orally drink small quantities of fluid.

More About Toads And Water

Toads generally live a highly terrestrial life and are not as dependent on water as most other frogs are. However, like all animals, toads still need to consume water to survive.

Toads do not ‘drink’ water as we do. Instead, they consume water by absorbing it through their permeable skin.

Toads in wet environments may sit and soak in shallow water to rehydrate, but others may rehydrate by absorbing moisture from moist soil, damp leaf litter, or other moist substrates.

Learn more about toads and water by reading these articles:

• Do toads like water?
• Can toads swim?

Sources:

J. Bentley, T. Yorio; Do Frogs Drink? J Exp Biol1 April 1979; 79 (1): 41–46. doi: https://doi.org/10.1242/jeb.79.1.41

Fitzsimons, J.T. (1975). Thirst and Sodium Appetite in the Regulation of the Body Fluids.In: Peters, G., Fitzsimons, J.T., Peters-Haefeli, L. (eds) Control Mechanisms of Drinking. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-61907-6_1

P.J. Bentley, K. Schmidt-Nielsen, Acute effects of sea water on frogs (Rana pipiens), Comparative Biochemistry and Physiology Part A: Physiology, Volume 40, Issue 2, 1971, Pages 547-548, ISSN 0300-9629, https://doi.org/10.1016/0300-9629(71)90047-8.

Katz; NaCl adaptation in Rana ridibunda and a comparison with the euryhaline toad Bufo viridis. J Exp Biol1 December 1975; 63 (3): 763–773. doi: https://doi.org/10.1242/jeb.63.3.763 

Malcolm S. Gordon, Vance A. Tucker; Osmotic Regulation in the Tadpoles of the Crab-Eating Frog (Rana Cancrivora). J Exp Biol 1 June 1965; 42 (3): 437–445. doi: https://doi.org/10.1242/jeb.42.3.437

Condensation onto the Skin as a Means for Water Gain by Tree Frogs in Tropical Australia. Christopher R. Tracy, Nathalie Laurence, and Keith A. Christian

The American Naturalist 2011 178:4, 553-558

Ezra Mushala

Hi, my name is Ezra Mushala, i have been interested animals all my life. I am the main author and editor here at snakeinformer.com.

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The post How Do Toads Drink Water? first appeared on Snake Informer.