Water shrews are Britain's largest shrew, dependent on clean, well-vegetated waterway margins, and face welfare challenges from water pollution, bank management, and loss of aquatic invertebrate prey.
Water shrews experience welfare harm primarily through habitat degradation affecting both shelter and food availability. Pollution-driven declines in aquatic invertebrates reduce food security, causing starvation stress particularly in winter when energetic demands are high. Bank clearing and hard engineering remove the vegetated margins they need for foraging cover and burrowing. Agricultural drainage schemes alter water levels and flow regimes disrupting waterway margin habitats. Their small body size means cold winter periods with inadequate food lead to rapid energy depletion and death. Clean Water Act enforcement, stream restoration, and careful bank management directly benefit water shrew welfare.