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. …

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

Nov 29, 2025 · 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 …

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

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 …

Join us and help create a future where birds, nature, and people can thrive. We believe that people make the difference in every conservation challenge. Through participatory science …

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...

Oct 25, 2025 · Birds are a highly diverse and successful group of vertebrates that are found on every continent, including Antarctica. They are characterized by their feathered bodies, wings, …

Unlock species accounts, maps, multimedia, and bird family overviews. For public and academic libraries, government agencies, consulting firms, nature centers, nonprofits, and more. For …

eBird transforms your bird sightings into science and conservation. Plan trips, find birds, track your lists, explore range maps and bird migration—all free.