Vertebrates include dinosaurs, pterosaurs, crocodiles, champsosaurs, lizards, snakes, turtles, frogs and salamanders. Anurans are the amphibians lacking a tail such as frogs and toads. Frog-dogs are sentient reptiles with characteristics of both frogs and dogs. While tadpoles control algal populations, adult frogs forage on insects. Juvenile bullsnakes depend on small lizards, frogs, and baby mice. Their nearest relatives are the frogs and toads, within Batrachia. Less commonly taken prey includes stick insects, bugs, amphipods, lizards, frogs and occasionally, seeds. There are also numerous endemic frogs and snails. The park is also home to turtles, alligators, rabbits, frogs, and raccoons. It feeds mainly on insects, frogs and fish. The American mink is a carnivore that feeds on rodents, fish, crustaceans, frogs, and birds. Tundra is largely devoid of poikilotherms such as frogs or lizards. They are found in frogs and modern reptiles. In the adult stage, amphibians (especially frogs) lose their gills and develop lungs. Rasputin the Mad Frog is a member of the Punk Frogs.