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bird : any of a class (Aves) of warm-blooded vertebrates distinguished by having the body more or less completely covered with feathers and the forelimbs modified as wings — Webster   See also   OneLook


Birds, also known as Aves, are a group of endothermic vertebrates, 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. Birds live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. They rank as the world’s most numerically-successful class of tetrapods, with approximately ten thousand living species, more than half of these being passerines, sometimes known as perching birds. Birds have wings which are more or less developed depending on the species; the only known groups without wings are the extinct moa and elephant birds. Wings, which evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in flightless birds, including ratites, penguins, and diverse endemic island species of birds. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming. — Wikipedia

Bird (Encyclopædia Britannica)

Bird Guide (All About Birds, The Cornell Lab)
Bird Finder (Ask a Biologist, Arizona State University)
Birds (SeaWorld Parks & Entertainment)

Birds (One Zoom)
Aves (Catalogue of Life)
Birds (WolframAlpha)




Ornithology is a branch of zoology that concerns the methodological study and consequent knowledge of birds with all that relates to them. A wide range of tools and techniques are used in ornithology, both inside the laboratory and out in the field. Most biologists who consider themselves to be “Ornithologists” study specific categories, such as Anatomy, Taxonomy, or Ecology lifestyles and behaviors. — Wikipedia

Ornithology (Encyclopædia Britannica)

Introduction to Ornithology (Environmental Science)




DDC: 598 Birds (Library Thing)
Subject: Birds (Library Thing)

Subject: Birds (Open Library)

LCC: QL 671 Birds (UPenn Online Books)
Subject: Birds (UPenn Online Books)

LCC: QL 671 Birds (Library of Congress)
Subject: Birds (Library of Congress)

Subject: Birds (WorldCat)




Bird Migration (Science Trek)
Birds Above You (Biology4Kids)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources



What is an Ornithologist? (Environmental Science)

Zoologists and Wildlife Biologists (CareerOneStop, U.S. Department of Labor, Employment and Training Administration)


Ornithological Council
American Ornithological Society
National Audubon Society


Ornithology (American Ornithological Society)
Audubon Magazine (National Audubon Society)

Birds (EurekaAlert, American Association for the Advancement of Science)
Birds (bioRxiv: Preprint Server for Biology, Cold Spring Harbor Laboratory)
Birds (Science Daily)
Birds (Science News)
Birds (



Bird (


More News …

Birds News -- ScienceDaily Bird news and research. From chickens to birds of prey, wing design to migration, read all the latest news on birds.

  • New research turns what we know about bird window...
    on February 2, 2023 at 1:18 pm

    New research reveals that decals intended to reduce incidents of bird window strikes -- one of the largest human-made causes of bird mortality -- are only effective if decals are placed on the outside of the window. Researchers found that the patterns on the films and decals placed on the internal surface of windows do not reduce collision because they may not be sufficiently visible to birds.

  • To know where the birds are going, researchers...
    on February 1, 2023 at 3:28 pm

    Computer scientists recently announced a new, predictive model that is capable of accurately forecasting where a migratory bird will go next -- one of the most difficult tasks in biology. The model is called BirdFlow, and while it is still being perfected, it should be available to scientists within the year and will eventually make its way to the general public.

  • Pheasants at risk on unfamiliar ground
    on January 23, 2023 at 5:32 pm

    Pheasants are most likely to be killed by predators on unfamiliar ground, new research shows.

  • Avian flu could decimate Australian black swans
    on January 23, 2023 at 2:57 am

    The unique genetics of the Australian black swan leaves the species vulnerable to viral illnesses such as avian flu, new research has revealed.

  • DNA from domesticated chickens is tainting...
    on January 19, 2023 at 7:15 pm

    The red junglefowl -- the wild ancestor of the chicken -- is losing its genetic diversity by interbreeding with domesticated birds, according to a new study. - latest science and technology news stories internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Colombia, a biodiversity hotspot, holds lessons...
    on February 6, 2023 at 4:00 pm

    Plants and animals do not respect legal boundaries, oblivious to the policies that govern different jurisdictions. A new Stanford-led study highlights how policies in forestry, agriculture, and other sectors can fit together to govern biodiversity in a more coordinated and effective way. Published Feb. 6 in Nature Ecology & Evolution, the first of its kind analysis focuses on Colombia, one of the world's most biodiverse countries, finding that biodiversity is governed by almost 200 distinct […]

  • The first global estimate of the combined weight...
    on February 6, 2023 at 3:34 pm

    Arthropods crawl and buzz around us in the wild and on farmlands, on the street and at home, under our floors and in our plumbing systems, even in our food and on our bodies. But while we often are inconvenienced by this group of invertebrates—which comprises more than a million species, including all insects—their absence would be catastrophic: Arthropods are ecosystem engineers that pollinate our crops, turn over agricultural soils and sustain an enormous diversity of predators, from […]

  • Are you thinking of raising chickens because of...
    on February 6, 2023 at 2:19 pm

    The record-breaking price of eggs has encouraged some people to consider raising chickens in the backyard, but it's important to do some research before buying those cute little chicks.

  • Bird flu detected in mammals but risk to humans...
    on February 3, 2023 at 6:29 pm

    Experts have warned that the recent detection of bird flu in mammals including foxes, otters, minks, seals and even grizzly bears is concerning but emphasized that the virus would have to significantly mutate to spread between humans.

  • Fossils in a northern Alberta riverbed may reveal...
    on February 3, 2023 at 4:29 pm

    Alberta has been ground zero for dinosaur discoveries in Canada since the 1880s, when several Geological Survey of Canada expeditions collected dinosaur bones from the southern part of the province.


Here are links to pages about closely related subjects.

Knowledge Realm

Terrestrial   (Earth)

Sphere Land, Ice, Water (Ocean), Air, Life (Cell, Gene)
Ecosystem Forest, Grassland, Desert, Arctic, Aquatic

Tree of Life
Microorganism Virus
Prokaryote Archaea, Bacteria
Eukaryote Protist, Fungi, Algae, Protozoa (Tardigrade)
Plant Flower, Tree
Cnidaria Coral, Jellyfish
Cephalopod Cuttlefish, Octopus
Crustacean Lobster, Shrimp
Arachnid Spider, Scorpion
Insect Ant, Bee, Beetle, Butterfly
Fish Seahorse, Ray, Shark
Amphibian Frog, Salamander
Reptile Turtle, Tortoise, Dinosaur
Bird Penguin, Ostrich, Owl, Crow, Parrot
Mammal Platypus, Bat, Mouse, Rabbit, Goat, Giraffe, Camel, Horse, Elephant, Mammoth
Walrus, Seal, Polar Bear, Bear, Panda, Cat, Tiger, Lion, Dog, Wolf
Cetacean Whale, Dolphin
Primate Monkey, Chimpanzee, Human


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.