Rook (Corvus frugilegus).

The rook (Corvus frugilegus) is a member of the family Corvidae in the passerine order of birds. It was given its binomial name by Carl Linnaeus in 1758. The binomial is from Latin; Corvus for "raven" and frugilegus is Latin for "fruit-gathering" from frux, "fruit" and legere, "to pick". The English name is ultimately derived from the bird's harsh call. Rooks are distinguished from similar members of the crow family by the bare grey-white skin around the base of the adult's bill in front of the eyes. The feathering around the legs also looks shaggier and laxer than the carrion crow. The juvenile is superficially more similar to the crow because it lacks the bare patch at the base of the bill but it has a thinner bill and loses the facial feathers after about six months.
(Wikipedia).

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