Amphibian

A cold-blooded, smooth-skinned vertebrate of the class Amphibia, such as a frog, toad, or salamander, that characteristically hatches as an aquatic larva with gills. The larva then transforms into an adult with air-breathing lungs.

Vertebrate animals that have life stages both in water and on land (e.g., salamanders, frogs, and toads). Animals capable of living either in water or land.