- 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
- 10 MOST Common Birds Found in Los Angeles, CA (2025) - Bird Watching HQ
Despite being a large city, I think you would be surprised at the number of species that you can find in downtown Los Angeles and the surrounding areas Many types of birds can adapt to the presence of humans, even building nests and raising their babies in close proximity
- 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
- 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
- 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
- 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
- Birds in Los Angeles, California - Bird Buddy WIKI
Discover bird species in Los Angeles! Learn about common backyard birds, migration patterns, and the best birdwatching spots in Los Angeles, California
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