- 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
- 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
- 40 Different Types of Birds With Names, Photos, More!
Discover fascinating bird types! From giant ostriches to tiny kiwis, learn about different types of birds, their unique traits, and more!
- 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…
- Whats That Bird? | Audubon
Have you ever seen a large, black bird fly by and wondered: Is that a crow or a raven? Do you have trouble telling the difference between a swallow and a swift?
- 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
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