Definition: Amphibials, or aquatic animals, are organisms that live in water but do not swim like fish. They include frogs, toads, crustaceans (like crabs), and many other species. Amphibians have lungs and skin that allow them to breathe underwater; while reptiles, birds, and mammals do not. The term comes from Greek "amphibiast," meaning "swimming," since these animals swim or sometimes dip their heads in water.
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