Amphibians are ectothermic vertebrates, that need water, or a moist environment, to survive. An ectotherm is an organism in which internal physiological sources of heat are of relatively small or quite negligible importance in controlling body temperature. They develop in water by transformation and afterward live in water or on land.

What is the origin of amphibians?

Millions of years ago, strange fish-like animals emerged from the sea and exposed themselves to the dangers of life on land.

These were the ancestors of the amphibians.

Over time, the fins turned into legs that were necessary as they had to adjust to the absence of vertical pressure from the bottom up that they had in the water.

And by breathing they had to adjust to life on land. Respiratory breathing eventually gave way to breathing in the lungs and skin.

How do amphibians reproduce?

Millions of amphibians lay their eggs in the spring after they have pooled in bars. Their eggs look like a gelatinous mass that collects at the bottom of the water around the aquatic plants.
Tadpoles hatch after a certain period of time, which is different for each species, and depending on the heat of the water.

Immediately they can live completely independently.

They feed on algae and microscopic animals. They progressively lose their branchiae, and their lungs and limbs start to develop. Then they go out to the surface of the water to breathe with their newly acquired lungs. When the gills and tails are completely gone, small frogs come out of the water.


What amphibians have no legs?

Caecilians, which have no legs, are burrowing animals that look a lot like giant earthworms. Scientists have identified more than 4,000 kinds, or species, of amphibians.
As they spend their life underground, their feet are completely gone, tiny eyes lose all despair for light, and become numb and audible.

The legless amphibians are descended from the first amphibians that came out to earth. That is why they form a very important link in the development of the first fish that reached the breathing lungs and subsequently progressively turned amphibians on one side and reptiles on the other. They appear to be the first vertebrates to leave the aquatic environment to live on earth. They lay their eggs in cavities underground. When the larvae emerge from the eggs, they rush to the water to complete their development. But when they grow up, they cross the earth and spend the rest of their lives in underground corridors.

What distinguishes a common frog from a toad?

Many people feel disgusted with toads. They are uglier than ordinary. They are stocky, their skin is dry and warty, and they make small jumps. Their heads are flatter than ordinary frogs and their legs are shorter. They spend most of their lives on earth moving harder than ordinary frogs. The ordinary frog is much more alive than the toad, which gladly seeks shelter under the stone or under the leaves and does not emerge until its temperature is appropriate.

Toad is useful because it destroys harmful insects and snails. There is also a green toad that lives far away from water during the summer.

How do the other frogs live?

Frogs have become accustomed to various conditions of life.
There are about 500 species of frogs that live on trees. The ones on the fingers have grips to hold. In Malaysia, there are species of frogs that they call "flying frogs" because of their specific morphology adapted to flying. Thanks to wide-spread toes with skins, this animal can jump from a great height. In fact, it falls more from the tree than / what it flies, thus catching insects that would get her to just jump.

Other species of frogs live in ponds, lakes, grass, shaded areas, and even pits.