Birds

Wikimedia Commons has media related to Birds and Aves.

Wikispecies has information related to Aves.

Birds are bipedal, warm-blooded, egg-laying vertebrates characterized primarily by feathers, forelimbs modified as wings, and hollow bones. This category 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.