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. …

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

Many people are curious about the types of the birds they encounter, and putting names to those birds is a rewarding experience. We’re here to help with resources to help you, from our bird …

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 …

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 …

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 …

Feb 11, 2026 · eBird transforms your bird sightings into science and conservation. Plan trips, find birds, track your lists, explore range maps and bird migration—all free.