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Water vole

Arvicola amphibius

Once widespread across Britain’s waterways, the water vole almost vanished from Cumbria, including much of the Eden catchment ... although we are running a successful project to reintroduce them.

 Their decline is largely due to habitat fragmentation and the spread of the non-native American mink, a predator that can swim and enter vole burrows with ease. 

As a result, water voles are classified as Endangered in Great Britain and are fully protected under Section 5 and 9 of the Wildlife and Countryside Act, 1981 (as amended).

Water vole peeking out of a cardboard tube.
Super stats:

Length: 14-22cm

Average weight: 140g-350g

Average lifespan: 6-18 months

Did you know?

Water voles used to be known as “earth hounds”, “water moles” and “water dogs”

Did you know?

Since summer 2023, we've released 750 water voles in the Lowther catchment ... and they're thriving!

About water voles

What do water voles look like?

Water voles are often mistaken for brown rats, but they have several distinctive features:

  • Rounded face with a blunt nose,
  • Small, rounded ears that are barely visible under their fur,
  • Thick, chestnut-brown fur,
  • Short, furry tail (unlike the long, hairless tail of a rat),
  • Large, dark eyes,
  • Stocky body, with a tail about half the length of the body.

They have a gentle, almost teddy bear-like appearance and are most often seen sitting upright while feeding on vegetation near the water’s edge.

 

A Short Life, Full of Life

Water voles live for just 6 to 18 months, but in that time, a single female can produce three to four litters, each with around five young. This rapid reproduction gives them a chance to recover—if we can protect their habitats.

 

Feeding habits: grazers of the riverbank

Water voles are herbivores, feeding mainly on:

  • Grasses and reeds
  • Aquatic plants
  • Bulrushes, sedges, and rushes
  • Roots, bark, and soft shoots

They prefer to eat in the same spot repeatedly, leaving behind distinct piles of nibbled vegetation, often cut at a 45-degree angle. These feeding stations are a helpful sign for spotting their presence.

In summer, their diet is rich in lush green vegetation, while in colder months, they may rely more on bark and roots and food they have stored. Occasionally, they may nibble on insects or carrion, but this is rare and not a significant part of their diet.

Water voles need to eat 80% of their body weight in food daily to survive!

Photos from Eden Rivers Trust's water vole releases

  • Brown water vole moving through grass
    Ben Challis
  • Water vole peeping out of a white plastic tray filled with straw
    Ben Challis
  • A wet water vole, side on view of its face and long whiskers/
    Andrew Currie
  • Brown water vole on a partly submerged tree branch. It is looking into the water. The water is still and the water vole's reflection can be seen
    © Andrew Currie
  • Water vole half obscured by the riverbank
    Andrew Currie
  • The heads of two water voles are vying for space, peeping out of a hole in their soft release box, ready to go out into the wild
    Andrew Currie

Britain’s fastest declining mammal

The numbers are stark:

Once estimated at 8 million, the UK water vole population has plummeted to around 132,000. They’ve disappeared from 94% of sites where they once lived. This makes them Britain’s fastest declining mammal.

That's why we're taking action to bring back Ratty to Eden's riverbanks!

Adopt a water vole

NEW! Adopt a Water vole adoption pack. For £20 you can support our reintroduction and habitat improvement programme … and it makes a great gift!

Adopt a water vole

NEW! Adopt a Water vole adoption pack. For £20 you can support our reintroduction and habitat improvement programme … and it makes a great gift!

Reintroduce a riverbank hero – adopt a water vole today
Water vole peeking out of a cardboard tube.
Water vole scat at borrow entrance.

Signs and sightings

Water voles are shy, but they leave clues behind. Look for:

  • Piles of nibbled grass near the water’s edge,
  • Burrow entrances in riverbanks,
  • Fresh latrines (piles of poo) near the entrance to the burrow, and
  • Occasional sightings of the voles themselves, often seen sitting and feeding in the same spot.

They can be seen year-round, but are still extremely rare in most of the Eden catchment. If you think you’ve spotted one, please let us know—your sighting could help conservation efforts.

Narrow river channel with steep sides for water voles. Channel has grassy banks on either side.

Habitat needs: a delicate balance

Water voles are highly dependent on specific habitat conditions to survive:

  • Dense, long riverside vegetation provides cover from predators and shelter from the elements.
  • Steep, sandy or soft soil riverbanks are essential for burrowing and nesting.
  • Slow-moving and fairly deep water like streams, ditches, and ponds offer safe feeding grounds.
  • Wetland mosaics with ponds and backwaters help them escape flooding and provide alternative refuge.

Unlike otters, water voles are not well adapted to aquatic life. Their fur becomes waterlogged, and they lack webbed feet, making them vulnerable to drowning during floods or being washed out of their burrows. In England, they are now mostly restricted to within 5–10 metres of riverbanks or wetlands, whereas in mainland Europe, they occupy a broader range of habitats.

Grey box on top of a grey raft floating on water.
Ben Challis

Under threat from an unnatural predator

Water voles evolved alongside native predators like herons and otters, but the arrival of the American mink changed everything. Female mink are small enough to enter vole burrows, and their excellent swimming ability makes escape nearly impossible. 

As a result, water voles have been pushed to the brink in many areas.

Mink control in the Eden

We have an active American mink control programme in place that is now expanding outwards from the Lowther catchment. Our vision is to create a mink-free buffer across Cumbria. 

We’re always looking for farmers, landowners, and local partners who are interested in supporting this vital work. Whether you can host a monitoring raft (see picture), help with access, or simply want to learn more, we’d love to hear from you.

📞 Call us on 01768 877688 to find out how you can help restore balance to our rivers and wetlands.

How you can help water voles

You can support the survival of water voles in the Eden:

Adopt a water vole 
and help raise money to improve habitat to make more homes,
Report sightings 
to us (especially outside the Lowther catchment),
Protect riverbanks 
by avoiding trampling or disturbing vegetation,
Support our mink control programme, 
See our farm and land management page for details,
Avoid pollution
never pour chemicals or anything that isn't the 3Ps down drains,
Volunteer 
for habitat restoration or monitoring projects,
Create suitable habitat for water voles 
if you manage land or gardens near rivers - talk to us about features and techniques!