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About
Birds are a group of warm-blooded vertebrates constituting the class Aves (/ˈeɪviːz/), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton
Birds are vertebrate animals that have feathers, wings, and beaks. Like all vertebrates, they have bony skeleton. Most birds are able to fly, but some (like ostriches and penguins) cannot fly even though they still have wings
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