There is a particular hush that settles over a slow-moving brook on a still morning. The water barely seems to move, curling around tree roots and whispering past clumps of sedge. It is in these quiet places that one of Britain’s most secretive mammals goes about its business, almost entirely unseen. The water vole, once a familiar sight along our waterways, has become a rarity. Yet with patience and a little knowledge, you can learn to read the signs it leaves behind – without ever disturbing the animal itself.

The hidden lives of water voles

Water voles are stout, chestnut-brown rodents with blunt noses, small rounded ears and a surprisingly short tail. They are often mistaken for brown rats, but rats have pointed snouts, prominent ears and a much longer, scaly tail. Water voles are gentle vegetarians, feeding almost entirely on grasses, sedges, reeds and other waterside plants. They are also highly territorial and secretive, slipping into the water at the slightest sound. A loud, distinctive “plop” as one dives is often the only evidence you will ever have that a vole was there at all. Because they are so shy, and because their numbers have fallen dramatically across the UK, the best way to enjoy them is through the clues they leave along the bank.

Reading the bank: burrows and runs

The most reliable sign of water voles is their burrows. These are neat, circular holes, usually between five and eight centimetres across, dug into the bank at or just above the waterline. They often cluster together, and you may find them tucked beneath the roots of alder, willow or hawthorn. Look also for runs – flattened tunnels through the grass, about five to ten centimetres wide, leading from the burrow entrance down to the water’s edge. These runs are worn smooth by constant use and often form a network along a favoured stretch of brook. Another giveaway is a grazed “lawn” around the burrow: water voles crop the vegetation very short, creating a tidy patch that contrasts with the longer grass nearby. If you spot a small, greenish-brown pile of droppings on a flat stone or a raised tussock, that is a latrine. Water voles use these communal toilets regularly, and they are a strong confirmation that the animals are active in the area.

Feeding signs and the tell-tale nibble

Water voles are tidy eaters, and their leftovers are easy to identify once you know what to look for. They cut stems and leaves at a distinctive 45-degree angle, leaving a neat, chisel-like end. You will often find small piles of these cut stems, each about ten to twenty centimetres long, floating on the water or lying on a flat stone or log. These are feeding stations, and they are usually close to a burrow or a run. In summer, look for rafts of cut grass and sedge drifting slowly downstream. In winter, when other food is scarce, water voles will strip bark from willow, alder and other soft-barked trees, leaving pale, gnawed patches low down on the trunk. All of these signs are best observed from a distance – never poke at a burrow or try to flush a vole out, as this causes stress and may cause them to abandon a favoured site.

Fieldcraft for quiet observation

If you hope to actually see a water vole, you will need to be patient, still and lucky. The best times are early morning and late afternoon, when the animals are most active. Approach the brook slowly, keeping low and avoiding sudden movements. Choose a spot where you can sit comfortably with your back against a tree, and then simply wait. Give it at least fifteen minutes of complete stillness. Binoculars help, but a quiet pair of eyes is often enough. Watch for a V-shaped wake moving across the water, or a brown shape slipping from a burrow into the brook. Listen for the plop, and then scan the opposite bank for a small, rounded head emerging from the water. Keep dogs on a lead and stay on established paths. Never trample the bank or push through vegetation, as this can collapse burrows and expose the voles to predators.

A year in the life of a brook

Water voles live their lives in a steady rhythm that mirrors the seasons. In spring, breeding begins and young voles start to emerge from burrows, tentatively exploring the runs. Summer is the busiest time, with constant feeding and the growth of new generations. By autumn, the animals are preparing for winter, storing food and repairing burrows. On mild winter days, they may still be seen slipping in and out of the water, but they spend much more time underground. After rain, look for fresh tracks in the mud along the bank – small, star-shaped footprints with five toes on the hind foot. In snow, their trails are unmistakable: low, narrow furrows leading from burrow to water. Each season offers a different set of clues, and keeping a simple notebook of what you see and when can deepen your understanding of your local brook.

Protecting a declining neighbour

Water voles have suffered one of the most severe declines of any British mammal, losing over ninety per cent of their former range. The main threats are habitat loss, pollution and predation by the introduced American mink. You can help simply by being a careful observer. Record any signs you find and pass them to your local biological records centre – this information is vital for conservation. Avoid clearing vegetation along the bank, as voles need dense cover for food and shelter. Never dredge or straighten a brook, and keep livestock away from fragile banks. Most importantly, enjoy these animals quietly. The secret life of a water vole is a privilege to witness, and the best way to protect it is to leave no trace of your visit. Walk softly, watch patiently, and let the brook keep its secrets.