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Bird - Wikipedia
Birds are a group of warm-blooded vertebrates constituting the class Aves, 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.
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
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.
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 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 ...
Bird - Definition, Types, Characteristics, Habitat, Life span, & Picture
Birds are warm-blooded vertebrates characterized by feathers on their bodies, toothless beaked jaws, hard-shelled calcareous eggs, and a four-chambered heart with a high rate of metabolism.
Birds - National Wildlife Federation
Explore facts and photos about birds found in and around the United States. Learn about their range, habitat, diet, life history, and more.
Birds - BirdLife International
“Birds are among the most crucial species to the global ecosystem. They must be protected at all costs.” For millennia, birds have been winging their way across the globe and through our imaginations.
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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