Friday, 25 November 2011

Amphibians





The amphibians belong to the class amphibian. Ectothermoc or cold blooded animals like frogstoadssalamandersnewts, and caecilians metamorphose from a juvenile, water breathing form to an adult, air breathing form. Amphibians are four limbed animals. As by their ancestors "the fish" the amphibians lay eggs in the water. Amphibians are similar to the reptiles. Amphibians are cold blooded animals that posses backbone and are the direct offspring of fishes. They have the capacity to live both on land as well as in water.
Salamander

Frog


Amphibians have complex circulatory system unlike fish that have scales. The larvae of the amphibians that develop in the water breathe through gills while the adults breathe through skins and lungs. Some amphibians are terrestrial at some point of time in their life cycle.
The word amphibian means two-lives.  Amphibians spend their lives in the water and on land.

Tadpole

All amphibians begin their life in water with gills and tails. As they grow, they develop lungs and legs for their life on land. 
Toad

Amphibians are cold-blooded, which means that they are the same temperature as the air or water around them. 
Caecilian
Salamander
 
Caecilian
 
Frog

There are more than 4,000 different kinds of amphibians. Members of this animal class are frogs, toads, salamanders, newts, and caecilians or blindworms.



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