An amphibian is a type of cold-blooded vertebrate that typically lives both in water and on land. They are characterized by their smooth, moist skin, which helps them absorb water and breathe. Common examples of amphibians include frogs, toads, and salamanders. Most amphibians undergo a life cycle that includes a larval stage, often aquatic, before transforming into their adult form. Amphibians play important roles in ecosystems as both predators and prey. They help control insect populations and serve as food for various animals, including birds and snakes. Unfortunately, many amphibian species are threatened by habitat loss, pollution, and climate change, making their conservation crucial.