Red squirrel conservation requires managing the welfare of both red squirrels threatened by disease and grey squirrels that carry it, creating difficult ethical trade-offs in conservation management.
Red squirrel conservation presents one of the most philosophically challenging welfare trade-offs in British wildlife management. Grey squirrels are not culpable for carrying a disease that kills red squirrels, yet their presence drives the disease. The welfare of individual grey squirrels killed in conservation management must be weighed against the welfare of individual red squirrels dying from squirrelpox. The development of the oral immunocontraceptive vaccine offers a path that avoids this dilemma, by suppressing grey squirrel reproduction without lethal control. Supporting this technology is the most welfare-positive investment in red squirrel conservation currently available.