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AMPHIBIAN

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Animals that spend part of their lives in water and part on land are called amphibians. Usually, they hatch from eggs laid in streams or ponds. As adults, they move to land to live. The word amphibian comes from a Greek word that means ``living a double life.''

The animals in the class Amphibia are placed by scientists midway between fishes and reptiles in the animal kingdom. They probably developed millions of years ago from fish that stayed out of water for longer and longer periods. The first amphibians were the forerunners of all backboned land animals. None of the early amphibians exists today. Most forms of amphibians died out altogether. Those that survived ...

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