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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.

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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.