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Frogs are members of the family Ranidae, containing more than 400 species.
These frogs have the characteristics of:

* two bulging eyes
* strong, long, webbed hind feet that are adapted for leaping and swimming
* smooth or slimy skin (generally, frogs tend to like moister environments)
* Frogs tend to lay eggs in clusters.

Frogs from this family can be found on every continent except Antarctica. They are referred to as the "true frogs" because of their generalized body form and life history: the so-called generic frog.
Members of this family include the bullfrog, common frog, green frog, leopard frog, marsh frog, pickerel frog, and wood frog.