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Birds are a group of warm-blooded vertebrates constituting the class Aves characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, ...
Birds have three characteristics that distinguish them from other animals: feathers; hard-shelled eggs; and hollow bones. FEATHERS: Feathers are an adaptation ...
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, any of the more than 10400 living species unique in having feathers, the major characteristic that distinguishes them from other animals.
As predators and scavengers, birds of prey are vital to balanced and healthy ecosystems. We have national and internatio...