Animals with moist skin that can live on land or in the water, including frogs, toads and salamanders.
Warm-blooded, egg-laying animals covered with feathers. They have wings instead of arms.
A huge group of animals without backbones, including insects, worms, clams and sponges.
Cold-blooded animals with fins instead of arms and legs. They live and breathe in the water.
Warm-blooded animals that feed milk to their babies – from huge elephants to tiny bats and even humans.
Animals with cold blood that lay eggs and have bodies covered with dry scales – think turtles, crocodiles and snakes.
In spite of their massive bulk and heavy horns, bighorn sheep are good swimmers.