An animal that can live both in water and on land is called an amphibian. Amphibians, such as frogs, toads, and salamanders, have a unique life cycle that typically includes an aquatic larval stage and a terrestrial adult stage. Their skin is permeable, allowing for gas exchange and the absorption of moisture, which makes them largely dependent on moist environments. Amphibians are crucial to ecosystems, serving as both predators and prey, and they help control insect populations. However, they are facing significant threats from habitat loss, pollution, and climate change, leading to declines in many species.