On an island, feral cats are eating a native bird species to extinction. Welfare advocates may support trap-neuter-release (allowing the cats to live but stopping reproduction). Rights advocates struggle here: Do you have a "right" to predate? Usually, rights frameworks break down at the ecosystem level.
Animal welfare is based on the premise that it is morally acceptable for humans to use animals for food, research, and companionship, provided they are treated humanely and spared unnecessary suffering. On an island, feral cats are eating a