Some birds are huge and some are tiny. Some birds are fantastically colorful and some are plain. What do all birds share? Early nonfiction expert Lizzy Rockwell explains that birds have beaks, wings, and feathers, and are hatched from eggs. Other animals might have some of these features in common, but only a bird has them all. Only a bird is a bird! A clear text and graceful illustrations cover dozens of different birds and their shared characteristics, as well as the unique qualities of unusual birds, such as penguins and peacocks.