the top of a poplar tree with fallen leaves. black rooks sit on the bare branches. atmospheric autumn scene

silhouette birds treetop many black white raven crows tree ornithology wildlife watching swarm natural nature flock bird habitat twigs outdoor winter outline outside rooks rest scrub wilderness seasonal wild sit relax abstract light avian backlit barebranched branches brushwood animals corbies group contour monochrome crow feather branch rook corvus frugilegus city