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  1. Bird - Wikipedia

    Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming. The study of birds is called ornithology.

  2. Bird | Description, Species, Feathers, & Facts | Britannica

    Dec 17, 2025 · 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 …

  3. Online bird guide, bird ID help, life history, bird sounds from …

    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

  4. Bird Pictures & Facts - National Geographic

    The smallest is the two-inch-long bee hummingbird. Everything about the anatomy of a bird reflects its ability to fly. The wings, for example, are shaped to create lift.

  5. Bird Facts - A-Z Animals

    Oct 25, 2025 · Although all bird species have wings, some are actually flightless animals that only use their wings for balance and not for flying. Other birds, such as penguins, use their wings …

  6. Avibase - The World Bird Database

    Dec 19, 2025 · Avibase is an extensive database information system about all birds of the world, containing over &1 million records about 10,000 species and 22,000 subspecies of birds, …

  7. Bird - Definition, Types, Characteristics, Habitat, Life span, & Picture

    May 6, 2025 · With their populations constantly declining, 1,227 bird species were listed as threatened by BirdLife International and the IUCN in 2009. However, conservation efforts are …

  8. eBird - Discover a new world of birding...

    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.

  9. All About Birds - Birds, Cornell Lab of Ornithology

    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 ...

  10. Birds of the World - Cornell Lab of Ornithology

    Join us for a virtual presentation with Caribbean guide and conservationist, Ryan Chenery, who will discuss the special challenges faced by single-island endemic bird species.