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 …

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.

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 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...

Nov 6, 2025 · bird, (class Aves), any of the more than 10,400 living species unique in having feathers, the major characteristic that distinguishes them from all other animals.

6 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.

All About Birds is your free online guide to birds and bird watching. Explore in-depth species information, tips from the Lab’s experts, and inspirational v ...

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 …

5 days ago · America’s state birds are a colorful cast of characters—some elegant, some quirky, and some… well, surprisingly loud. Whether you’re brushing up for trivia night or planning a …

5 days ago · Field marks aren't just jargon. They reveal how birds look, move, and behave. Because, as Olivia writes, "the build of a bird clues us into its behavior, and vice versa."