Warm-blooded animals are the animals which can maintain a body temperature higher than their environment. Mammals and birds are warm-blooded. Dolphins, whales, seals, sea lions, and otters are all mammals. Some examples of warm-blooded are whales, dogs, lions, cats, vultures, and raccoons. Reptiles, insects, and fish (amphibians) including snakes, lizards, turtles and crocodiles are cold-blooded.