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| | YourArt.com >> Encyclopedia >> Frog (Site not responding. Last check: 2007-09-18) |
 | | A distinction is often made between frogs and toads on the basis of their appearance, prompted by the convergent adaptation among so-called toads to dry environments; however, this distinction has no taxonomic basis. |
 | | Frogs and toads are broadly classified into three suborders: Archaeobatrachia, which includes four families of primitive frogs; Mesobatrachia, which includes five families of more evolutionary intermediate frogs; and Neobatrachia, by far the largest group, which contains the remaining 24 families of "modern" frogs, including most common species throughout the world. |
 | | The skin secretions of some toads, such as the Colorado River Toad and Giant Neotropical Toad, contain bufotoxins, some of which, such as bufotenin, are psychoactive, and have therefore been used as recreational drugs. |
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