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Amphibian, class of cold-blooded vertebrates, including frogs, toads, newts, salamanders, and caecilians. Typically they spend part of their life in water, part on land. They are distinct from reptiles in that their eggs must be laid in moist conditions, and that their soft, moist skins have no scales. The larval amphibian is usually solely aquatic; the adult is partly or entirely terrestrial, generally 4-legged, and carnivorous.

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