On islands where stoats are invasive predators threatening endangered birds, intensive control raises welfare trade-offs between stoat suffering and the survival of vulnerable prey species.
Stoat control in conservation settings involves genuine welfare trade-offs. Stoats are sentient mammals capable of suffering, and lethal control methods cause real harm. However, without control, stoats cause mass mortality of endangered birds that are irreplaceable. The welfare case for control rests on the much larger number of animals suffering from stoat predation versus those killed in control operations. Welfare improvements focus on using the most humane methods — well-maintained snap traps rather than poison where feasible — and exploring fertility control research as a longer-term alternative.