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. More than …

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

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

Jan 24, 2026 · Bird, any of the approximately 11,200 living species unique in having feathers, the major characteristic that distinguishes them from other animals. They are warm-blooded vertebrates more …

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 projects, …

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

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...

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 rate of metabolism.

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, and ability to …

May 24, 2019 · Discover the main types of birds, from common groupings like birds of prey and water birds to the 40 scientific bird orders. Explore examples, classification, and bird diversity worldwide.