Carrion Crow

The carrion crow has black plumage with a green or purple sheen, much greener than the gloss of the rook, and a black bill, legs and feet. At 48–52 centimetres it is clearly smaller than the common raven, which averages about 63 centimetres, and its all-black plumage separates it from the hooded crow. It has a wingspan of 84–100 centimetres and weighs 400–600 grams. Juveniles are brownish with blue eyes, both of which darken as the bird matures. (Wikipedia, general species account)

Unlike the generally gregarious rook, the crow is largely solitary, though crows are often sociable at winter roosts and may feed alongside rooks. The voice is the best distinction: a deep, guttural, slightly vibrant kraa, usually delivered three or four times in quick succession from a vantage point such as a building or treetop. The carrion crow and hooded crow are very closely related, and a slightly larger allied subspecies, C. c. orientalis, occurs in the east. (Wikipedia, general species account)