Birds
Birds
Birds (Aves) are a group of warm-blooded vertebrates constituting the class Aves, characterized 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.
Pronunciation
- English: /bɜːrd/
- IPA: /bɝd/
Etymology
The word "bird" comes from the Old English "brid," meaning "chick," "nestling," or "bird."
Related Terms
- Avian: Pertaining to birds.
- Ornithology: The scientific study of birds.
- Feathers: The distinctive outer covering of birds.
- Beak: The projecting jaws of a bird, covered in a hard, horny sheath.
- Egg: The hard-shelled reproductive body produced by birds.
- Metabolism: The chemical processes that occur within a living organism in order to maintain life.
- Heart: The organ in birds that pumps blood through the body.
- Skeleton: The internal framework of birds, made up of bones and cartilage.
External links
- Medical encyclopedia article on Birds
- Wikipedia's article - Birds
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