Grey squirrels introduced from North America have displaced red squirrels across much of Britain, and their management raises welfare questions about lethal control of sentient invasive species.
Grey squirrel management presents a genuine ethical tension between the welfare of individual grey squirrels — sentient, intelligent animals that did not choose their introduction — and the conservation welfare of red squirrel populations being driven toward extinction. Lethal control causes real welfare harm to individual grey squirrels, particularly when trapping and killing methods are imperfectly applied. The conservation case for lethal management is compelling: without grey squirrel reduction in red squirrel refuges, red squirrel extinction in Britain is likely. Welfare-conscious management uses the most humane available methods, minimises unnecessary killing and invests in non-lethal fertility control development as a long-term alternative. The ethical weight of preventing a native species extinction justifies proportionate lethal management when humanely conducted.