The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further …

Detailed information for more than 600 North American bird species, including ID help, browse by shape and taxonomy, and deeper articles.

Explore more than 800 North American bird species, learn about their lives and habitats, and how climate change is impacting their ability to survive.

6 days ago · 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 …

Everything about the anatomy of a bird reflects its ability to fly. The wings, for example, are shaped to create lift. The leading edge is thicker than the back edge, and they are covered in ...

Apr 17, 2022 · 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 …

Jul 18, 2025 · Welcome to Birdsology, your go-to source for insightful bird guides, identification tips, and fascinating discoveries about avian life.

May 6, 2025 · 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 …

A global alliance of nature organizations working to document the natural history of all bird species at an unprecedented scale.

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