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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 — Merriam-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)



Explore related posts on Cosma



Talks about Birds (TED: Ideas Worth Spreading)
Articles about Birds (Big Think)




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 (JSTOR)
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 insect genus discovered in one of the most...
    on September 27, 2023 at 4:32 am

    The Allpahuayo-Mishana National Reserve in Peru has often been described as the most biodiverse rainforest in the world. For example, in recent decades, scientist have discovered several new bird species from the region. Researchers from the University of Turku in Finland have studied the insect biodiversity in Allpahuayo-Mishana for over 20 years. In their latest study, the scientist described a new wasp genus, Capitojoppa, to science.

  • Caribbean parrots thought to be endemic are...
    on September 25, 2023 at 7:38 pm

    For the first time, researchers have extracted ancient DNA from Caribbean parrot fossils and archaeological specimens, showing that species thought to be endemic to particular islands were historically more widespread and diverse.

  • Study shows birds that have evolved greater...
    on September 25, 2023 at 4:48 pm

    Research shows that birds with more complex skeletons are more specialized and so are less species rich.

  • Migratory birds can be taught to adjust to...
    on September 22, 2023 at 3:08 pm

    One result of climate change is that spring is arriving earlier. However, migratory birds are not keeping up with these developments and arrive too late for the peak in food availability when it is time for breeding. By getting the birds to fly a little further north, researchers have observed that these birds can give their chicks a better start in life.

  • Dinosaur feathers reveal traces of ancient...
    on September 21, 2023 at 7:45 pm

    Palaeontologists have discovered X-ray evidence of proteins in fossil feathers that sheds new light on feather evolution. - 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.

  • 'New way of looking at nature': These naturalists...
    on September 29, 2023 at 5:26 pm

    As Raquel García-Álvarez guides hikers on a trail surrounding the Sand Ridge Nature Center, her remarks on flora and fauna are interrupted by geese honking. She explains, as curious onlookers admire the birds skirting the water, that there's more to them than meets the eye.

  • Genome study reveals 30 years of Darwin's finch...
    on September 29, 2023 at 2:35 pm

    An international team of researchers has released a study on contemporary evolutionary change in natural populations. Their study uses one of the largest genomic datasets ever produced for animals in their natural environment, comprising nearly 4,000 Darwin's finches. The study has revealed the genetic basis of adaptation in this iconic group. The results are published in the journal Science.

  • Bird flu kills 400 seals, sea lions in Uruguay
    on September 29, 2023 at 7:55 am

    An estimated 400 seals and sea lions have turned up dead on the coast of Uruguay in recent weeks, blamed by authorities on bird flu.

  • Scientists ratchet up key amino acid in corn
    on September 28, 2023 at 9:08 pm

    Experimental lines of field corn developed by a team of Agricultural Research Service (ARS) and university scientists will usher in new commercial hybrids offering high-methionine grain.

  • New animal behavior tech aims to save wildlife
    on September 28, 2023 at 8:16 pm

    Facial recognition software used to study the social behavior of individual Greylag Geese in Europe will soon be used to monitor one of the rarest geese in the world, the Cape Barren Goose in South Australia.


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.