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| navigate by keyword : approximately are aves avialae bird birds blooded clade class egg feathered laying legged living most ranks species ten tetrapod the thousand two vertebrates warm winged with |
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| Birds (class Aves or clade Avialae) are feathered, winged, two-legged, warm-blooded, egg-laying vertebrates. Aves ranks as the tetrapod class with the most living species, approximately ten thousand. |
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