The class Amphibia contains about 2600 species; they are zoologically divided in Anura (amphibia without tails, e. g. frogs and toads) and Urodela (amphibia with tails, e. g. salamanders and newts); both of these orders are subdivided into numerous genera which can be widely differentiated by their morphology.
KeywordsDilute Hydrochloric Acid Skin Secretion Steroid Alkaloid Venomous Animal Water Frog
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