Managing invasive species to protect native ecosystems frequently involves lethal control of individual animals, creating difficult welfare tradeoffs that conservationists must navigate.
Invasive species management creates genuine welfare dilemmas. Killing millions of sentient animals (feral cats, rabbits, cane toads) causes real suffering in those individuals, even when it reduces greater suffering across native wildlife populations. The welfare calculus requires weighing the welfare of individual invasive animals against the welfare of many more native animals they kill or displace. Humane killing methods, fertility control where practical, and public transparency about the tradeoffs all matter. New Zealand's Predator Free 2050 goal represents the most ambitious example of this welfare-conservation tension.