- Bird - Wikipedia
Birds live worldwide and range in size from the 5 5 cm (2 2 in) bee hummingbird to the 2 8 m (9 ft 2 in) common ostrich There are over 11,000 living species and they are split into 44 orders More than half are passerine or "perching" birds
- 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 List - San Diego, California, United States - eBird
Explore a complete list of bird species observations in this region
- 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 | 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 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
- 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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