Rooks are highly social corvids that nest colonially in rookeries and roost communally in winter, and their welfare is closely tied to farmland invertebrate availability and roost site security.
Rooks in areas of intensive farming with reduced invertebrate populations face nutritional stress during the breeding season when chick provisioning demands peak. Roost disturbance displaces birds from thermal refugia during cold nights. The intelligence and social complexity of rooks means that individual welfare is influenced by the quality of social bonds and information sharing within colonies. Rookeries disrupted by human activity show reduced breeding success.