- 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
- Online bird guide, bird ID help, life history, bird sounds from Cornell . . .
Use our Bird Guide to identify birds, learn about the life history, listen to the sounds, and watch bird behavior on video--the most comprehensive guide to Nort
- 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
- Cornell Lab of Ornithology—Home
Join us and help create a future where birds, nature, and people can thrive We believe that people make the difference in every conservation challenge Through participatory science projects, practical conservation actions, and broad partnerships, we offer limitless ways for you to deepen your interests and passions What’s that bird?
- 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
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