- 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 . . .
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
- 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
- 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?
- Birds: Different Types, Definition, Photos, and More - A-Z . . .
Birds, members of the class Aves, include more than 10,400 living bird species – more than half being passerine, or “perching” birds Their feathers distinguish them from all other classes of animal; no other animals on earth have them
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