Invasive non-native species cause significant welfare harms to native UK wildlife through predation, competition, and disease, while control methods raise their own ethical questions.
Invasive species management presents a genuine welfare dilemma: allowing invasive species to continue causes widespread suffering and death among native wildlife, while control programmes involve lethal methods that cause welfare harms to the invasive animals themselves. Welfare-conscious management favours humane control methods, targets most-impactful species, and uses lethal control only where no effective non-lethal alternative exists. The welfare calculus generally favours control of highly damaging invasive species to protect the greater welfare of native populations.