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).
For more information about the topic Frog zoology, read the full article at Wikipedia.org, or see the following related articles:
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