Amphibian introduction

There are three orders in the Class Amphibia: Anura (frogs and toads), Caudata (salamanders), and Apoda (caecilians). The order Anura has the most species, with 4000 members worldwide, and 81 in North America.

Of 390 salamander species that exist worldwide, only 112 reside in North America. The third amphibian group, the caecilians, is smaller still with a total of only 162 species, all of which are restricted to the tropics.

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