Animated films about birds , a group of endothermic vertebrates , characterised 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 .
This category has the following 13 subcategories, out of 13 total.
The following 196 pages are in this category, out of 196 total. This list may not reflect recent changes .