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The largest is the nine-foot-tall ostrich. Explore in-depth species information, tips from the lab’s experts, and inspirational v. Birds are a group of warm-blooded vertebrates constituting the class aves, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four … They are warm-blooded … Use our bird guide to identify birds, learn about the life history, listen to the sounds, and watch bird behavior on video–the most comprehensive guide to nort · birds are warm-blooded vertebrates characterized by feathers on their bodies, toothless beaked jaws, hard-shelled calcareous eggs, and a four-chambered heart with a high … Species accounts for all the birds of the world. Everything about the anatomy of a bird reflects its. Birds are found worldwide and in all habitats. All about birds is your free online guide to birds and bird watching. Discover them all with birds of the world. The smallest is the two-inch-long bee hummingbird. · bird, any of the more than 10,400 living species unique in having feathers, the major characteristic that distinguishes them from other animals.