The native red squirrel faces extinction in most of Britain due to the introduced grey squirrel, raising welfare questions about conservation methods used.
Red squirrel conservation involves difficult welfare trade-offs. Lethal grey squirrel control - currently the main conservation tool - causes suffering to hundreds of thousands of grey squirrels annually. However without control, red squirrels face population collapse from disease and competition. Welfare-sensitive conservationists support development of immunocontraception as a humane alternative. The welfare of individual animals must be weighed against species-level conservation outcomes.