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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.

  • Coffee plantations limit birds' diets
    on March 20, 2023 at 6:37 pm

    A new study explores a record of birds' diets preserved in their feathers and radio tracking of their movements to find that birds eat far fewer invertebrates in coffee plantations than in forests, suggesting that the disturbance of their ecosystem significantly impacts the birds' dietary options.

  • Hummingbirds use torpor in varying ways to...
    on March 20, 2023 at 2:20 pm

    Hummingbirds use the hibernation-like state of torpor in varying ways, depending on their physical condition and what is happening in their environment, according to new research.

  • Humans are altering the diet of Tasmanian devils,...
    on March 16, 2023 at 3:41 pm

    New research shows how human-modified landscapes affect the diets of these marsupial scavengers.

  • Bird flu associated with hundreds of seal deaths...
    on March 15, 2023 at 5:24 pm

    Researchers have found that an outbreak of highly pathogenic avian influenza (HPAI) was associated with the deaths of more than 330 New England harbor and gray seals along the North Atlantic coast in June and July 2022, and the outbreak was connected to a wave of avian influenza in birds in the region.

  • High winds can worsen pathogen spread at outdoor...
    on March 14, 2023 at 3:07 pm

    A study of chicken farms in the West found that high winds increased the prevalence of Campylobacter in outdoor flocks, a bacterial pathogen in poultry that is the largest single cause of foodborne illness in the U.S. Researchers found that about 26% of individual chickens had the pathogen at the 'open environment' farms in the study, which included organic and free-range chicken farms. High winds the week prior to sampling and the farms' location in more intensive agricultural settings were […] - 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.

  • Bird-brained? Climate change may affect...
    on March 22, 2023 at 5:00 pm

    Large brains are a hallmark of human evolution. Brains allow us to make sense of the world and to successfully navigate through our lives.

  • 25-million-year-old fossils of a bizarre possum...
    on March 22, 2023 at 4:33 pm

    Imagine a vast, lush forest dominated by giant flightless birds and crocodiles. This was Australia's Red Center 25 million years ago. There lived several species of koala; early kangaroos the size of possums; and the wombat-sized ancestors of the largest-ever marsupial, Diprotodon optatum (around 2.5 tons).

  • Sea otters killed by unusual parasite strain
    on March 22, 2023 at 3:00 pm

    Four sea otters that stranded in California died from an unusually severe form of toxoplasmosis, according to a study from the California Department of Fish and Wildlife and the University of California, Davis. The disease is caused by the microscopic parasite Toxoplasma gondii. Scientists warn that this rare strain, never previously reported in aquatic animals, could pose a health threat to other marine wildlife and humans.

  • A 5,000-mile seaweed belt is headed toward Florida
    on March 22, 2023 at 2:33 pm

    A 5,000-mile seaweed belt lurking in the Atlantic Ocean is expected in the next few months to wash onto beaches in the Caribbean Sea, South Florida, and the Yucatán Peninsula in Mexico.

  • Sea ice may soon disappear from the Arctic during...
    on March 22, 2023 at 1:59 pm

    The "Last Ice Area" north of Greenland and Canada is the last sanctuary of all-year sea ice in this time of rising temperatures caused by climate change. A new study now suggests that this may soon be over.


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.