Birds are vertebrates with feathers, modified for flight and for active metabolism. Birds are a monophyletic lineage, evolved once from a common ancestor, and all birds are related through that common origin.
Birds (Aves), also known as avian dinosaurs, are a group of endothermic
vertebrates, characterised by feathers, toothless beaked jaws, the laying of ...
Comprehensive guide to North American birds and bird watching from the
Cornell Lab of Ornithology. Includes Bird Guide with identification, life history,
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
With no resolution to the standoff in sight, birders are concerned that one of the
nation's premier observation spots for birds will be off limits for the foreseeable ...
New York State is home to a variety of bird species. Besides information on
specific birds and endangered species of birds, the following information and
Learn all you wanted to know about birds with pictures, videos, photos, facts, and
news from National Geographic.
Birds are warm-blooded vertebrates (vertebrates have backbones) and are the
only animals with feathers. Although all birds have wings, a few species can't fly.
Find information on birds courtesy of the San Diego Zoo.
After significant declines in population during much of the 20th century, our
national symbol has made a comeback in many areas since the 1970s. (Photo: