Birds are a class of warm-blooded vertebrates distinguished by feathers, toothless beaked jaws, hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds are found all over the world and range in size from 5.5 cm (2.2 in) bee hummingbirds to 2.8 m (9 ft 2 in) common ostriches. There are approximately ten thousand living species, with more than half of them being passerine, or “perching” birds. Birds have wings that develop differently depending on the species; the only known groups that do not have wings are the extinct moa and elephant birds. Wings, which are modified forelimbs, enabled birds to fly, but subsequent evolution has resulted in the loss of flight in some birds, including ratites.
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