ocr: WHAT IS A BIRD? HERE ARE ABOUT 9,000 species of birds in the world. They live in a wide range of habitats, Feathers from deserts to polar ice. Birds are warm-blooded, and are the only vertebrates that can fly, apart from bats. All birds have a toothless beak and a body covering of feathers, and lay hard-shelled eggs. GOULDIAN FINCH Like all birds, this finch has Tail a. feathered body and scaly legs. BIRD ANATOMY FLIGHT SEE COURTSHIP NESTS EGGS MIGRATION CLASSIFICATION NEXT ALSO