Water voles have undergone catastrophic population decline in the UK, with habitat restoration and mink control providing dual welfare and conservation benefits.
Water vole welfare and conservation are inseparably linked through the mink predation dynamic. Individual water voles face acute welfare harm from mink predation: mink can pursue voles into their burrows and throughout riparian habitat with extreme efficiency, causing colony extinction events that represent mass welfare harm through violent predation deaths. Surviving voles in mink-affected areas experience chronic fear-related welfare compromise, as the persistent threat of a highly effective predator alters behaviour in ways that compromise foraging success and reproductive investment. Mink control programmes - typically using cage trapping and humane killing - raise their own welfare questions about the mink killed, but the welfare arithmetic is generally considered to favour control given the extraordinary scale of water vole welfare harm. Habitat restoration that creates dense riparian vegetation provides refugia where voles can better evade predation and expresses their natural burrowing and foraging behaviour. The welfare benefit of successful restoration is demonstrated by rapid population recovery where conditions are right, suggesting that surviving voles quickly express normal behavioural repertoires when predation pressure is removed.