Stoat eradication from island nature reserves has enabled dramatic seabird and ground-nesting bird population recovery, demonstrating the welfare benefits of predator removal from vulnerable habitats.
Seabirds and other ground-nesting birds on islands with stoats face continuous predation pressure that causes direct welfare harm through nest failure, egg loss, and chick predation. The chronic stress of breeding in high-predation environments affects parental condition and behaviour. Successful stoat eradication eliminates this welfare burden entirely, allowing birds to breed without the chronic threat they evolved to respond to but cannot adequately defend against when prey populations are isolated on islands. Post-eradication population responses including increased clutch success and reduced abandonment demonstrate directly improved breeding welfare.