The animal known to live both in water and on land is the amphibian. Amphibians, like frogs and salamanders, are characterized by their dual life stages: they typically start their life cycle in water as larvae (tadpoles) and then transition to a terrestrial environment as adults. Their unique adaptations allow them to thrive in both ecosystems, making them a fascinating group of animals that play essential roles in their habitats. The moist skin of amphibians also allows for the absorption of oxygen, making them dependent on both environments to survive.