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Frog zoology

About 400 million years ago, some members of the sarcopterygian group of fish moved onto land.

These became the first amphibians.

Today, these animals still spend part of their lives in water and return to water for reproduction.

There are over 3,000 known species of modern amphibians, which includes Anura (frogs and toads), Urodela (newts and salamanders), and Gymnophiona (burrowing amphibians).

Note:   The above text is excerpted from the Wikipedia article "Frog zoology", which has been released under the GNU Free Documentation License.
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