Spotting Water Voles: Telling Them Apart from Rats

There are few better moments on a British riverbank than the one where you realise the dark shape on the far bank is not a rat. Water voles are among our most endearing waterside mammals, and once you know what you are looking for, they are surprisingly easy to tell apart from their much-maligned cousins. The trick is to stop, watch for twenty seconds longer than feels comfortable, and let the animal — and the bank itself — give you the answer.

Ratty in "The Wind in the Willows" was a water vole, not a rat, which says a great deal about how familiar these animals once were. Numbers have fallen sharply since the 1970s, so every confident sighting is genuinely worth recording.

The four features that settle it

If you get a clear view of an animal sitting still, these four details will identify it every time.

• Nose. A water vole's nose is blunt and rounded, almost boxy when seen head-on. A brown rat's snout tapers to a sharp, pointed tip.
• Ears. Water voles have small, rounded ears that barely peek out of the fur and are often pressed flat against the head. Rat ears are large and prominent, standing clearly away from the skull.
• Fur. Water voles are a warm chestnut-brown, usually with a slightly darker back and a paler belly, and the coat looks velvety and well-groomed. Rats are a colder grey-brown, scruffier and greasier in appearance.
• Tail. This is the clincher. A water vole's tail is roughly half its body length, covered in fine fur, and looks like a stubby, hairy extension of the body. A rat's tail is longer than its body, hairless, scaly and faintly ringed.

Size is a poor guide, so do not rely on it. Both animals run to roughly 20–25cm in body length, and a big water vole can look every bit as substantial as a young rat.

Behaviour: nibblers versus scurriers

Movement often gives the game away before you ever see a nose. A water vole tends to sit up on its haunches, calm and deliberate, holding a grass stem or reed in both front paws and nibbling it down like a small person eating a stick of celery. It will happily stay put while you watch.

A brown rat, by contrast, is restless. It darts in short bursts, twitches its nose constantly, and slips in and out of cover with a nervy, purposeful shuffle. If the animal looks like it is late for something, it is almost certainly a rat.

On the water, water voles swim high, with the head, back and trailing tail all visible, and they dive with a distinctive, loud plop that carries across the river. Rats swim lower in the water and usually slip beneath the surface quietly. That plop is often the first sign you get, and it is worth stopping to scan the bank immediately afterwards.

Reading the bank: burrows, runs and latrines

Even when the animals stay hidden, water voles leave a tidy, unmistakable signature on the bank.

• Burrow entrances. Look for holes roughly 5–8cm across, cut into the bank within a metre or two of the water, often tucked beneath overhanging grass or exposed roots. A close-cropped lawn of grazed grass around the entrance is a strong clue.
• Runs. Flattened, tunnel-like paths pressed through the grass at the water's edge, leading straight down the bank and into the river.
• Latrines. Piles of dark, tarry droppings, each about the size of a grain of rice, left at burrow mouths and along runs. Rats scatter their droppings singly and widely; water voles stack them in one spot, sometimes on a flat stone or a mossy ledge.
• Feeding stations. Neat little piles of chopped stems with clean, angled cuts, left on a grazed patch or a floating leaf. The leftovers are tidy and concentrated, not scattered.

Where and when to look

Water voles favour slow-moving or still water with soft, steep banks they can tunnel into, and plenty of lush bankside vegetation — sedges, reeds, willowherb, meadowsweet and coarse grasses. You will find them on rivers, canals, dykes, ditches, flooded gravel pits and even upland streams in Scotland, though rarely on fast, rocky stretches with hard banks.

Dawn and dusk are the golden hours. Pick a stretch that is not heavily trampled by livestock or crowded with people, find a spot where you can sit low and still, and give it twenty quiet minutes. Binoculars help enormously, but a patch of bank forty metres away is quite close enough to read the tail and nose.

Watching well without disturbing them

Water voles are sensitive to disturbance, and their burrows are fragile, so a few gentle habits make a real difference.

• Stay on the path and avoid pushing through tall bankside vegetation, which crushes runs and exposes burrows.
• Keep dogs out of the water along known vole stretches, especially in spring and summer when young are about.
• Sit still and wear dull colours. Voles are far more likely to reappear if you look like part of the scenery.
• Clean and dry your boots and kit between wetland sites to avoid moving soil, seeds and disease around the country.
• Never handle a water vole, block a burrow, or let a child "help" by digging at the bank.

If you spot an American mink — a sleek, dark, uniform animal that swims low and fast — it is worth reporting to your local records centre. Mink predation is one of the biggest pressures on water vole populations, and knowing where they are helps those working to protect the voles.

When in doubt, watch for the plop

Most confusion comes from brief glimpses, and brief glimpses are exactly when a rat looks most vole-like. So slow down. Look for the blunt nose, the hidden ears, the chestnut coat and the short hairy tail. Wait for the nibbling, the calm posture and the heavy, unbothered plop into the water. Then, if you can, write down the date, the grid reference and what you saw. A few minutes of patient watching on a quiet stretch of river is one of the simplest pleasures British wildlife has to offer — and your notes might just help keep these remarkable little animals on our waterways.