The secret life of water voles

An animal worth getting to know

The water vole is the animal most of us picture when we think of a riverbank: rounded, chestnut-brown, with a blunt nose, small hidden ears and a short furry tail. It is also one of the fastest-declining mammals in Britain, having vanished from perhaps nine out of ten of its former lowland sites since the 1970s. Strongholds remain in the Fens and East Anglia, the Somerset Levels, parts of North Yorkshire, and scattered river systems in Wales and Scotland.

The trouble is that water voles are shy, and a healthy population can live along a stretch of ditch for years without most people noticing. The trick is not to look for the animal, but to learn to read the bank. Once you can recognise the signs, a quiet walk along a dyke becomes a completely different experience.

Reading the signs on a grassy bank

Water voles leave a remarkable amount of evidence behind, much of it visible from a footpath with no disturbance at all.

• Clipped stems: look for lengths of grass, sedge or reed cut at a neat 45-degree angle, as though trimmed with secateurs. Rats gnaw stems too, but the cuts are usually rougher and at a shallower angle.
• Feeding stations: small piles or rafts of discarded chopped vegetation beside a burrow or on a flat stone, often with the leaves nibbled off and left behind.
• Burrows: oval entrances roughly 6–8cm across, dug into steep soft banks, frequently with a second entrance below the waterline. Never probe or dig into them — water vole burrows are legally protected in England, Scotland and Wales.
• Latrines: little heaps of blunt, oval droppings, often placed on a tussock, log or stone and used as territorial scent posts. Rat droppings are longer and pointed at the ends.
• Runs and lawns: flattened tunnels pushed through tall vegetation, leading to patches of closely cropped grass.
• Footprints: star-shaped prints with splayed toes and a frequent tail drag, most easily found in soft silt at the water's edge.

Where and when to watch

Water voles favour slow, shallow water with plenty of soft bank for burrowing and dense vegetation for food and cover. That means ditches, dykes, fenland drains, canals, chalk streams, pond margins and quiet lochs. A single animal may use 30–100 metres of bank, so a promising stretch is worth watching patiently rather than walking quickly.

They are active by day and night but are most visible in the early morning and the two or three hours before dusk, particularly between April and September when breeding is underway. Listen as much as you look: a sudden loud plop and a spreading bow wave usually means a vole has dived from the bank. In winter they do not hibernate but become far less active, moving higher up the bank when water levels rise.

The pressures on a wetland specialist

The decline has several causes, and they tend to work together. predation by American mink, escaped or released from fur farms, has been devastating because water voles have no effective defence against a semi-aquatic hunter. Alongside that sits habitat loss and fragmentation: drainage, heavy dredging, culverting, water abstraction and pollution have left many watercourses too bare, too fast or too isolated to support voles.

Extreme weather adds further strain. Prolonged flooding can drown burrow systems and scatter colonies, while summer droughts reduce food and leave banks hard and exposed. Because populations are now so patchy, a local extinction is often permanent — there are simply no nearby voles left to recolonise.

What conservation looks like on the ground

Practical water vole conservation is unglamorous but effective. Surveyors use floating mink rafts with clay trays to detect footprints, allowing targeted control in areas where voles are clinging on. Rivers trusts, wildlife charities and landowners work together on reintroduction projects, often after mink have been reduced and habitat restored.

Sympathetic management matters just as much: leaving a fringe of vegetation when dredging a ditch, working in short sections rather than clearing a whole system, maintaining buffer strips beside arable fields, and allowing banks to stay soft and vegetated. Wetland creation and restoration, including schemes that encourage natural water storage, can be quietly excellent for voles — they simply need somewhere quiet, damp and well-planted to live.

Watching and helping responsibly

Good observation is low-impact observation. Sit still and low against the bank, use binoculars, and scan slowly for movement or a bow wave. Keep to paths, keep dogs out of the ditch, and resist the urge to part vegetation or investigate burrows.

• Visit at dawn or dusk, and return to the same stretch several times — voles are creatures of habit.
• Record what you see, including signs, and send it to your local records centre so it counts towards future surveys.
• Volunteer with a local wetland or rivers project, or help with practical tasks such as vegetation management.
• Report mink sightings where you are asked to, and support wetland restoration wherever you can.

Water voles ask very little of us beyond clean water, soft banks and a bit of peace. Give them that, and one of our quietest mammals will slowly find its way back along the ditches where it belongs.