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Category:Birds

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Title: Category:Birds  
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Subject: Requests for comment/Inclusion criteria for Lists, Skin, Bird collections, History of paleontology in the United States, Heterothermy
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Popular Category:Birds

Birds are bipedal, warm-blooded, egg-laying vertebrates characterized primarily by feathers, forelimbs modified as wings, and hollow bones. This contains taxa at the order or higher level in the class of Aves.

For individual species of birds, see the subcategories, particularly Category:Birds by classification and Category:Birds by country.
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Birds
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