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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. Explore more than 800 north american bird species, learn about their lives and habitats, and how climate change is impacting their ability to survive. Detailed information for more than 600 north american bird species, including id help, browse by shape and taxonomy, and deeper articles.

All about birds is your free online guide to birds and bird watching. Dec 17, 2025bird, any of the approximately 11,200 living species unique in having feathers, the major characteristic that distinguishes them from other animals. Jan 5, 2026ebird transforms your bird sightings into science and conservation.

Plan trips, find birds, track your lists, explore range maps and bird migration—all free. May 6, 2025birds 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. Birds are found worldwide and in all habitats.

The smallest is the two-inch-long bee hummingbird. Everything about the anatomy of a bird reflects its. Birds of the world is a powerful resource that brings deep, scholarly content from four celebrated works of ornithology into a single platform where biologists and birders can find comprehensive 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 nort