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- Bird - Wikipedia
Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming The study of birds is called ornithology Birds are feathered dinosaurs , having evolved from earlier theropods , and constitute the only known living dinosaurs
- 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 | 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
- 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 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 - 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
- Bird Facts - A-Z Animals
Birds are a highly diverse and successful group of vertebrates that are found on every continent except for Antarctica They are characterized by their feathered bodies, wings, and ability to fly The evolution and origins of birds have long been the subject of scientific investigation and debate
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