From petite Hummingbirds to tall Whooping Cranes, birds are some of the most diverse animals on the earth. They are found in all types of habitats around the world and are one of the most abundant animals with more than 900 species in North America. Birds live in high-altitude mountains, dense forests, deserts, or near rivers and oceans. Some eat nuts and seeds, while others capture and eat small animals. Most birds fly, but some birds prefer to walk or even swim. Learn what birds have in common, how they are different, and how they are well-suited for their environment in this latest edition in the Compare and Contrast Book series.