There are over 11,000 living species and they are split into 44 orders. More than half are passerine or "perching" birds. Birds have wings whose development varies according to …

Dec 17, 2025 · bird, (class Aves), any of the approximately 11,200 living species unique in having feathers, the major characteristic that distinguishes them from all other animals.

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

We believe in the power of birds to ignite discovery and inspire action. Join us on a lifelong journey to enjoy, understand, and protect birds and the natural world.

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...

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

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 …

3 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.

Oct 25, 2025 · Explore how birds evolved, what they eat, and how they live. From flightless penguins to speedy falcons, discover the beauty of avian life.

Explore facts and photos about birds found in and around the United States. Learn about their range, habitat, diet, life history, and more.