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.
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This category has the following 4 subcategories, out of 4 total.
Pages in category "Birds"
The following 45 pages are in this category, out of 45 total.
- Mixed-species foraging flock (biology)
- Neotropical Birds Online (computing)
- Vinkensport (biology)