The cinereous vulture (Aegypius monachus) is a large raptor in the family Accipitridae and distributed through much of temperate Eurasia. It is also known as the black vulture, monk vulture and Eurasian black vulture. With a body length of , across the wings and a maximum weight of , it is the largest Old World vulture and largest member of the Accipitridae family.
Aegypius monachus is one of the largest birds of prey and it plays a huge role in its various ecosystems by eating carcasses, and which in turn reduces the spread of diseases. The vultures are constantly exposed to many pathogens because of their eating habits. A study on the gastric and immune defense systems done in 2015, sequenced the entire genome of the cinereous genome. Comparing the vulture and the bald eagle, will allow the study to find positively selected genetic variations associated with respiration and the ability of the vulture's immune defense responses and gastric acid secretion to digest carcasses.
Taxonomy
The genus name Aegypius is a Greek word (αἰγυπιός) for 'vulture', or a bird not unlike one; Aelian describes the aegypius as "halfway between a vulture (gyps) and an eagle". Some authorities think this a good description of a lammergeier; others do not. Aegypius is the eponym of the species, whatever it was in ancient Greek. The English name 'black vulture' refers to the plumage colour, while 'monk vulture', a direct translation of its German name Mönchsgeier, refers to the bald head and ruff of neck feathers like a monk's cowl. 'Cinereous vulture' (Latin cineraceus, ash-coloured; pale, whitish grey), was a deliberate attempt to rename it with a new name distinct from the American black vulture.
This bird is an Old World vulture, and as such is only distantly related to the New World vultures, which are in a separate family, Cathartidae, of the same order. It is, therefore, not closely related to the much smaller American black vulture (Coragyps atratus) despite the similar name and coloration.
Description
The cinereous vulture measures in total length with a wingspan. Males can weigh from , whereas females can weigh from . It is thus one of the world's heaviest flying birds. Average weights are not known to have been published for this species but the median weight figures from two sources were and . In Korea, a large survey of wild cinereous vultures was found to have weighed a mean of with a mean total length of , this standing as the only attempt to attain the average sizes of free-flying mature birds of the species, as opposed to nestlings or captive specimens. Unlike most accipitrids, males can broadly overlap in size with the females, although not uncommonly the females may be slightly heavier. These are one of the two largest extant Old World vultures and accipitrids, with similar total length and perhaps wingspans recorded in the Himalayan vulture (Gyps himalayensis), as indicated by broadly similar wing and tail proportions, but the cinereous appears to be slightly heavier as well as slightly larger in tarsus and bill length. Superficially similar but unrelated New World condors can either be of similar wing area and bulk or slightly larger in these aspects. Despite limited genetic variation in the species, body size increases from west to east based on standard measurements, with the birds from southwest Europe (Spain and south France) averaging about 10% smaller than the vultures from central Asia (Manchuria, Mongolia and northern China). Among standard measurements, the wing chord is , the tail is and the tarsus is .