Red squirrels face extinction in England and Wales from grey squirrel competition and squirrelpox.
Red squirrels dying from squirrelpox experience neurological symptoms including eye and mouth swelling before death. Each infected red squirrel represents individual suffering from a human-introduced disease. Grey squirrel management raises its own welfare questions — lethal control involves individual animal death. Conservation priorities must balance red squirrel welfare against grey squirrel welfare in management decisions.