Rook (Corvus frugilegus).

Rook (Corvus frugilegus) photographed in Brierfield, England, using a Nikon D90 with a 70-300mm Nikkor DX lens (105-450mm equivalent). Processed using Nikon Capture NX2 (sky effect from PicMonkey).

Though resident in Great Britain, Ireland and much of north and central Europe, vagrant to Iceland and northern Scandinavia, it also occurs as an eastern race in Asia where it differs in being very slightly smaller and more efficient on average, having a somewhat more fully feathered face. In the north of its range the species has a tendency to move south during autumn though more southern populations are apt to range sporadically. The species has been introduced to New Zealand, with several hundred birds being released there from 1862 to 1874, though today their range is very localised.
(Wikipedia).