Factsheet P22: Rooks and Crows
Rooks and crows (Corvus sp.) are one of the two main pests of nut crops in many countries including Britain (the other being squirrels.) In some countries, jays, magpies, starlings and blackbirds can also be a significant pest. Rooks nest communally in rookeries, whereas crows nests are solitary structures. In early spring, rooks assemble to repair and build nests in exactly the same spot as previous years.