Water Shrew Conservation and Wetland Habitat

Water shrews are among Britain's most rarely seen mammals, requiring clean waterways and good riparian habitat for their specialist aquatic hunting lifestyle.

Key Facts

Water shrews are the largest British shrew and the only species venomous enough to immobilise small prey
They are semi-aquatic, hunting aquatic invertebrates, small fish and amphibians in clean streams
Population trends are poorly known due to the difficulty of surveying this secretive species
Water quality degradation reducing aquatic invertebrate abundance directly affects food availability
Dense bankside vegetation provides shelter and burrowing sites essential for water shrew territories

Welfare Considerations

Water shrew welfare is closely tied to aquatic ecosystem health. Poor water quality reduces the invertebrate prey they depend on, forcing higher energy expenditure per calorie. Bankside management removing dense vegetation eliminates shelter and burrowing sites. Predation by introduced American mink, which readily hunts along waterways, affects water shrews as severely as it does water voles. Water quality improvement, mink control and sympathetic riparian management combine to create conditions where water shrew individuals can live and breed successfully.

What You Can Do

Support river restoration and water quality improvement projects benefiting aquatic ecosystems
Create dense riparian vegetation margins along garden ponds and watercourses
Advocate for agricultural pollution reduction improving invertebrate prey for water shrews
Report water shrew sightings to mammal societies contributing to distribution knowledge