Red squirrels are declining across the UK due to competition and squirrelpox virus from introduced grey squirrels, requiring intervention for population survival.
Red squirrels dying from squirrelpox suffer respiratory distress, conjunctivitis, and lesions before death - a significant individual welfare burden. Population-level decline causes welfare suffering at scale. Grey squirrel management to prevent virus transmission, while itself involving lethal control with welfare implications, is necessary to prevent greater suffering in red squirrel populations.