- Bird - Wikipedia
There are over 11,000 living species and they are split into 44 orders More than half are passerine or "perching" birds Birds have wings whose development varies according to species; the only known groups without wings are the extinct moa and elephant 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
- Online bird guide, bird ID help, life history, bird . . . - All About Birds
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
- Bird | Description, Species, Feathers, Facts | Britannica
bird, (class Aves), any of the more than 10,400 living species unique in having feathers, the major characteristic that distinguishes them from all other animals
- 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
- 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
- All About Birds - Land Trust Bird Conservation Initiative
All About Birds is an online guide to birds and bird watching, produced by the Cornell Lab of Ornithology It has information about over 700 North American species—helping users identify birds, learn about life history, listen to sounds, and watch videos of bird behavior
- 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
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