Here Comes The Rural Rook

"Invite the rook who high amid the boughs, In early spring, his airy city builds, And ceaseless caws amusive." James Thomson

Bare, greyish-white face, thinner beak and peaked head make it distinguishable from the carrion crow. Rooks are very sociable birds, and you're not likely to see one on its own. They feed and roost in flocks in winter, often together with jackdaws.

So there you have it.