Bird - Wikipedia Birds are a group of warm-blooded vertebrate animals constituting the class Aves, 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
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Guide to North American Birds | Audubon Explore more than 800 North American bird species, learn about their lives and habitats, and how climate change is impacting their ability to survive
Bird | Description, Species, Feathers, Facts | Britannica Bird, any of the approximately 11,200 living species unique in having feathers, the major characteristic that distinguishes them from other animals They are warm-blooded vertebrates more related to reptiles than mammals
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40 Types of Birds | Common Groups Scientific Orders (2026) Discover the main types of birds, from common groupings like birds of prey and water birds to the 40 scientific bird orders Explore examples, classification, and bird diversity worldwide