Water voles have suffered one of the fastest population declines of any UK mammal, driven by American mink predation and habitat loss, with recovery requiring large-scale intervention.
Water vole decline represents a cascade of welfare harms across multiple species. American mink - themselves escaped victims of the fur trade, a welfare scandal in its own right - hunt water voles to local extinction with devastating efficiency. Each mink kill represents fear, pain, and death for individual voles. At population level, the collapse of water vole communities has removed a key prey species for other predators, disrupting broader food web welfare. Mink control is the most effective conservation tool but involves killing or live-trapping sentient animals. Welfare standards for mink control should require humane trap design, frequent checking, and rapid killing. Habitat restoration that creates dense bankside vegetation gives surviving voles better hiding opportunities.