Description Birds are some of the most diverse animals on the earth. From tiny hummingbirds to huge Whooping Cranes, they can be found in all kinds of habitats around the world. Birds live in high altitude mountains, forests, deserts, or near rivers or oceans. Someeat nuts and seeds and others capture and eat other animals. While most birds fly, some prefer to walk or even swim. Their beaks, wings and tails help them survive in their habitat. Learn what birds have in common and how are they different in this latest in the Compare and Contrast Series.