The term for animals that live both on land and in water is "amphibians." Amphibians belong to a class of animals that typically undergo a two-stage life cycle, starting as aquatic larvae with gills (like tadpoles) and then transforming into air-breathing adults. Common examples of amphibians include frogs, toads, newts, and salamanders. They possess moist skin, which allows them to absorb water and breathe through their skin, in addition to using lungs in their adult form. This dual habitat characteristic makes amphibians unique and sensitive indicators of environmental health, as they thrive in both terrestrial and aquatic ecosystems.