Managing invasive species often requires lethal population control, creating welfare tradeoffs between protecting native biodiversity and the welfare of the invasive animals themselves.
Invasive species management welfare presents genuine ethical dilemmas: do the welfare interests of individual invasive animals outweigh the conservation of native species they are eliminating? Most welfare ethicists argue that prevention of ecosystem collapse and recovery of native species can justify lethal management, but methods matter enormously. Traps that cause prolonged suffering, anticoagulant poisons that cause slow death, and leg-hold traps are welfare-poor options that should be replaced with more humane alternatives.