Birds are a group of warm-blooded vertebrate animals constituting the class Aves, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four …

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Detailed information for more than 600 North American bird species, including ID help, browse by shape and taxonomy, and deeper articles.

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

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

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, …

May 4, 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 …

According to the Illinois Ornithological Society, a total of 459 species and one species group have been officially recorded in the state as of July, 2024. Near the bottom of each species page, you will notice …

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...

Oct 25, 2025 · Birds (Class Aves) are endothermic, feathered vertebrates characterized by beaks without teeth, egg-laying reproduction with hard-shelled eggs, and (in most species) the ability to fly. …