Managing invasive species to protect native ecosystems often involves lethal control of animals, raising significant welfare and ethical questions.
Invasive species management creates genuine ethical complexity when it involves killing individual sentient animals to protect ecosystems. Invasive mammals like rats, stoats, and cats have clear capacity for suffering - trapping and poisoning cause real pain and distress to the animals killed. Yet the alternative - allowing invasive species to continue devastating native wildlife - causes massive suffering and extinction of other sentient beings. The welfare of the invasive species and the welfare of native species they predate are in conflict. This conflict does not resolve simply, but it does require that invasive species management use the most humane available methods, pursue ongoing development of more humane alternatives, and honestly acknowledge the welfare costs of control programs rather than treating invasive species as unworthy of welfare consideration.