Controlling invasive species to protect native ecosystems requires honest engagement with the welfare costs to individual invasive animals.
Invasive species control creates irreducible ethical tension: protecting native species and ecosystems requires causing suffering and death to individual invasive animals who did not choose their presence in the ecosystem and cannot be blamed for their ecological impact. Second-generation anticoagulant rodenticides kill effectively but cause prolonged internal hemorrhage over several days - a welfare cost that would not be acceptable in domestic animal management contexts. Leghold and snap traps cause variable duration suffering depending on inspection frequency. Shooting, when practiced humanely with skilled marksmen, offers rapid death but requires significant effort per animal. The welfare-positive approach does not argue against invasive species management but requires using the most humane effective methods available, investing in developing more humane approaches, and honestly acknowledging welfare costs rather than dismissing invasive animals as unworthy of welfare consideration.