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In birds, the main arteries taking blood away from the heart originate from the right aortic arch (or pharyngeal arch), unlike in the mammals where the left aortic arch forms this part of the aorta. [77] The postcava receives blood from the limbs via the renal portal system.
[1] [2] Linnaeus generally followed the classification scheme introduced by the English parson and naturalist John Ray which grouped species based on the characteristics of each species’ bill and feet. [3] The 10th edition appeared in 1758 and was the first in which Linnaeus consistently used his binomial system of nomenclature. He increased ...
English: Full title: The code of nomenclature and check-list of North American birds adopted by the American Ornithologists' Union; being the report of the Committee of the Union on Classification and Nomenclature.
Bird anatomy, or the physiological structure of birds' bodies, shows many unique adaptations, mostly aiding flight.Birds have a light skeletal system and light but powerful musculature which, along with circulatory and respiratory systems capable of very high metabolic rates and oxygen supply, permit the bird to fly.
In free-range husbandry, the birds can roam freely outdoors for at least part of the day. Often, this is in large enclosures, but the birds have access to natural conditions and can exhibit their normal behaviours. A more intensive system is yarding, in which the birds have access to a fenced yard and poultry house at a higher stocking rate ...
Some birds will respond to a shared song type with a song-type match (i.e. with the same song type). [24] This may be an aggressive signal; however, results are mixed. [23] Birds may also interact using repertoire-matches, wherein a bird responds with a song type that is in its rival's repertoire but is not the song that it is currently singing ...
These birds are characterized by considerable amounts of dark slate-gray in their plumage; their malar areas are nearly always black. They feed mainly on smaller birds. Third are the peregrine falcon and its relatives, variably sized powerful birds that also have a black malar area (except some very light color morphs), and often a black cap ...
Hugh Whistler (28 September 1889 – 7 July 1943), F.Z.S., M.B.O.U. was an English police officer and ornithologist who worked in India. He wrote one of the first field guides to Indian birds and documented the distributions of birds in notes in several journals apart from describing new subspecies.