A creature that lives both on land and in water is called an amphibian. Amphibians, such as frogs, toads, and salamanders, are unique in that they typically undergo a life cycle that includes both aquatic and terrestrial stages. For example, many amphibians start life as eggs that hatch into larvae (tadpoles) in water, and as they mature, they develop into adults that can live on land. Their anatomy and physiology allow them to adapt to different environments, making them fascinating and versatile organisms.