The animal that can live both in water and on land is the amphibian, such as frogs and salamanders. Amphibians are unique creatures that typically start their lives in water as larvae with gills, later transitioning to adult forms that can breathe air and often live on land. This dual lifestyle allows them to thrive in various environments, but they remain closely tied to water for reproduction and skin moisture. Amphibians are crucial indicators of environmental health, and their populations are increasingly threatened by habitat loss, pollution, and climate change.