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Bird - Wikipedia Birds live worldwide and range in size from the 5 5 cm (2 2 in) bee hummingbird to the 2 8 m (9 ft 2 in) common ostrich There are over 11,000 living species and they are split into 44 orders More than half are passerine or "perching" birds
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 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
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 Pictures Facts - National Geographic Birds are found worldwide and in all habitats The largest is the nine-foot-tall ostrich The smallest is the two-inch-long bee hummingbird Everything about the anatomy of a bird reflects its
All About Birds - Birds, Cornell Lab of Ornithology All About Birds is your free online guide to birds and bird watching Explore in-depth species information, tips from the Lab’s experts, and inspirational v
Introduction to the Aves The Birds The vertebrate class Aves includes the birds, an extremely distinctive and successful clade, with an estimated 9000 species worldwide, including the snowy owl pictured here Although descended from the dinosaurs, birds have evolved remarkable specializations for flight: a unique "one-way" breathing system, light yet strong hollow bones, a skeleton in which many bones are fused or
Birds of the World - Cornell Lab of Ornithology Birds of the World is a powerful resource that brings deep, scholarly content from four celebrated works of ornithology into a single platform where biologists and birders can find comprehensive life history information on birds Every bird has a story Discover them all with Birds of the World About Birds of the World Team Subscribe