Birds are a group of warm-blooded vertebrates constituting the class Aves (Latin: [ˈaːwεs]), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.

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

2025年3月18日 · 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 vertebrates more related to reptiles than mammals.

eBird Status and Trend Maps reveal how birds are faring across continental scales. Explore the map for Baltimore Oriole. 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.

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. Explore in-depth species information, tips from the Lab’s experts, and inspirational v ...

Birds are vertebrate animals adapted for flight. Many can also run, jump, swim, and dive. Some, like penguins, have lost the ability to fly but retained their wings. Birds are found worldwide...

Birds live all over the world. They range in size from the 5 cm (2 in) bee hummingbird to the 2.70 m (9 ft) ostrich. There are about ten thousand species of birds. More than half of these are passerines, or perching birds. Birds have wings. The wings develop differently in different species.

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 information on birds. Every bird has a story. Discover them all with Birds of the World.