amphibian, Any member of a class (Amphibia) of cold-blooded vertebrate animals that includes more than 6,200 species in three groups: frogs and toads (order Anura), salamanders (order Caudata), and caecilians (order Gymnophiona). Probably evolved from certain fish species of the Early Devonian Epoch (416β397 million years ago; see Devonian Period), amphibians were the first vertebrates to move from an aquatic environment to land. Most species have an aquatic larval, or tadpole, stage that metamorphoses into a terrestrial adult, but a few species spend their entire life in water. Amphibians are found worldwide, the majority in the tropics.
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amphibian summary
What are examples of an amphibian?
Below is the article summary. For the full article, see amphibian.