- 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
- 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
- Search, All About Birds, Cornell Lab of Ornithology
Detailed information for more than 600 North American bird species, including ID help, browse by shape and taxonomy, and deeper articles
- 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
- 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 Pictures Facts - National Geographic
Birds are vertebrate animals adapted for flight Many can also run, jump, swim, and dive Some, like penguins, have lost the ability to fly but retained their wings Birds are found worldwide
- Bird Advisors
21 Blue Colored Birds In North America (And Why They Are NOT Actually Blue!) Shorebirds are found wandering along our lake shores, beaches, marshes, and wet areas and there are so many to identify Often they are well camouflaged but are fun to watch…
- Birds in Stockton, California - Bird Buddy WIKI
Discover bird species in Stockton! Learn about common backyard birds, migration patterns, and the best birdwatching spots in Stockton, California
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