Water Shrew Welfare and Clean Waterways

The water shrew is Britain largest shrew and the only truly aquatic shrew species, with welfare closely tied to the quality of the clear, clean waterways in which it hunts invertebrates, fish fry, and amphibians.

Key Facts

Water shrews are excellent swimmers, using their venomous saliva to paralyse aquatic prey
They have fringes of stiff hair on their feet and tail that assist swimming and diving
UK populations are found along clean, vegetated streams and pond margins with abundant invertebrates
Water shrews produce a musk scent that makes them unpalatable to most predators
They are rarely seen despite being locally common, remaining hidden in bankside vegetation

Welfare Considerations

Water shrew welfare depends entirely on the quality of freshwater habitats with clear water, abundant aquatic invertebrates, and dense bankside vegetation for cover and nesting. Pollution events causing invertebrate community collapse eliminate water shrews rapidly from affected stretches. Agricultural drainage reducing the connectivity of waterside habitats fragments populations. The species is a sensitive indicator of freshwater ecosystem quality, making its welfare status a measure of river and stream health across the landscape.

What You Can Do

Support river restoration programs that improve water quality and bankside vegetation
Advocate for strict enforcement of agricultural pollution regulations protecting waterways
Contribute water shrew records to county mammal recording groups using appropriate survey methods
Back Clean Water Act and Water Framework Directive implementation to maintain freshwater ecosystem quality
Engage with riparian buffer strip programs that maintain vegetated margins along streams and rivers