Bird - Wikipedia
WEBBirds are a group of warm-blooded vertebrates constituting the class Aves (/ ˈ eɪ v iː z /), 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.
List of birds - Wikipedia
WEBThis article lists living orders and families of birds. The links below should then lead to family accounts and hence to individual species. The passerines (perching birds) alone account for well over 5,000 species.
Bird - Simple English Wikipedia, the free encyclopedia
WEBBirds (Aves) are a group of animals with backbones. They evolved from dinosaurs. Technically, birds are dinosaurs. Birds are warm blooded. Their feathers help prevent loss of body heat. Modern birds do not have teeth. They have beaked jaws. Birds lay hard-shelled eggs. They have a high metabolic rate and a strong but lightweight skeleton.
List of birds of the United States - Wikipedia
WEBThe bald eagle is the national bird of the United States. The California condor is one of North America's most endangered birds. A comprehensive listing of all the bird species confirmed in the United States follows. It includes species from all 50 states and the District of Columbia as of July 2022.
List of birds by common name - Wikipedia
WEBIn this list of birds by common name, a total of 10,976 extant and recently extinct (since 1500) bird species are recognised. Species marked with a "†" are extinct. [1]
Origin of birds - Wikipedia
WEBThe scientific question of within which larger group of animals birds evolved has traditionally been called the "origin of birds". The present scientific consensus is that birds are a group of maniraptoran theropod dinosaurs that originated during the Mesozoic Era.
Bird | Description, Species, Classification, Types, & Facts
WEB3 days ago · Bird, any of the more than 10,400 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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