Σάββατο 27 Δεκεμβρίου 2014

Bird: Corvus cornix ( Hooded crow - κουρούνα, Κοράζινος)

Corvus cornix ( Hooded crow - κουρούνα, Κοράζινος)



The hooded crow (Corvus cornix) (also called hoodiecrow) is a Eurasian bird species in the crow genus. Widely distributed, it is also known locally as Scotch crow, Danish crow, and corbie or grey crow in Ireland. Found across Northern, Eastern and Southeastern Europe, as well as parts of the Middle East, it is an ashy grey bird with black head, throat, wings, tail and thigh feathers, as well as a black bill, eyes and feet. Like other corvids it is an omnivorous and opportunistic forager and feeder.
It is so similar in morphology and habits to the carrion crow (Corvus corone) that for many years they were considered by most authorities to be geographical races of one species. Hybridization observed where their ranges overlapped added weight to this view. However, since 2002, the hooded crow has been elevated to full species status after closer observation; the hybridisation was less than expected[by whom?] and hybrids had decreased vigour. Within the hooded crow species, four subspecies are recognized, with one, the Mesopotamian crow, possibly distinct enough to warrant species status itself.
Except for the head, throat, wings, tail and thigh feathers, which are black and mostly glossy, the plumage is ash-grey, the dark shafts giving it a streaky appearance. The bill and legs are black; the iris dark brown. There is only one moult, in autumn, as in other crow species. The male is the larger bird, otherwise the sexes are alike. The flight is slow and heavy and usually straight. The length varies from 48 to 52 cm (19 to 20 in). When first hatched the young are much blacker than the parents. Juveniles have duller plumage with bluish or greyish eyes and initially a red mouth. Wingspan is 98 cm (39 in) and weight is on average 510 grammes.[9]
The hooded crow, with its contrasted greys and blacks, cannot be confused with either the carrion crow or Rook, but the About this sound kraa (help·info) call notes of the two are almost indistinguishable.Wikipedia

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