Rooks are highly social corvids that breed in large colonies (rookeries) and their welfare is affected by rookery disturbance, persecution and changes in agricultural food availability.
Rookeries are disturbed or destroyed by tree felling, development near nesting trees and shooting. UK rook populations have declined by around 25% since the 1970s linked to agricultural intensification reducing earthworm availability. Legal pest control is sometimes used disproportionately. Welfare priorities include protecting rookeries during the breeding season and maintaining earthworm-rich grassland near roosting and foraging habitats.