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Bird - Wikipedia Archaeopteryx is often considered the oldest known true bird The first classification of birds was developed by Francis Willughby and John Ray in their 1676 volume Ornithologiae [6] Carl Linnaeus modified that work in 1758 to devise the taxonomic classification system currently in use [7] Birds are usually categorised as a biological class in traditional evolutionary taxonomy Modern
eBird - Discover a new world of birding. . . eBird transforms your bird sightings into science and conservation Plan trips, find birds, track your lists, explore range maps and bird migration—all free
Bird | Description, Species, Feathers, Facts | Britannica 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
Bird - Definition, Types, Characteristics, Habitat, Life span, Picture With their populations constantly declining, 1,227 bird species were listed as threatened by BirdLife International and the IUCN in 2009 However, conservation efforts are being undertaken to restore existing habitats and breed captive populations for reintroduction in the wild
Bird Pictures Facts - National Geographic The smallest is the two-inch-long bee hummingbird Everything about the anatomy of a bird reflects its ability to fly The wings, for example, are shaped to create lift
Birds - Smithsonian National Museum of Natural History Birds are found worldwide, and roughy 11,145 species are known to exist Ornithological research emcompasses many branches, including taxonomy, evolution, anatomy, ecology, conservation biology and wildlife management The Division of Birds serves the research community through the research of our scientists and stewardship of the bird collections