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Thursday, 2 January 2020

Birds

Birds are a group of warm-blooded vertebrates traditionally constituting the class Aves, characterized 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 live all over the world, ranging in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) Ostrich. There are about 10,000 living species, of which more than half are passerine or "perching" birds. Birds have wings whose development varies by species; extinct moa and elephant birds are the only recognized groups without wings. Wings, which evolved from forelimbs, gave birds the ability to fly, although further development in some birds led to the loss of flight such as ratites, penguins, and diverse endemic island species. Here are some free images of Birds.
Birds

Birds

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Birds

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Birds

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Birds

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Birds

Birds

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Birds

Birds

Birds

Birds

Birds

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