Turtles and tortoises are members of the Testudines reptile family characterized by their hard shells that allow them to retract their head and limbs for protection. Turtles and tortoises are separable by the fact that tortoises are land-dwelling creatures while most turtle species are at least partly aquatic creatures. Most tortoises live 80-150 years, although this is a debated fact with the Aldabra giant tortoise rumored to be able to live 255 years. Tortoises are typically herbivores, but turtles will eat aquatic plants, insects, snails, and small fish. Both turtles and tortoises are cold-blooded and rely on their habitat to maintain a comfortable body temperature.