A rodent seen swimming in a ditch or pond is easy to label as a rat. Sometimes it is a water vole, a species that has suffered one of the sharpest declines of any British mammal and is protected by law. Anyone planning pest control near a watercourse in England or Wales needs to know the difference before setting a trap or booking a treatment. This article sets out how the two animals differ and what the law says.
Telling a water vole from a brown rat
The Mammal Society describes water voles as having blunt noses, small ears and furry tails, and living near waterways. It describes brown rats as having greyish-brown fur, a prominent pointed muzzle and a long scaly tail, and says they are comparable to, although less “chubby” than, the water vole. The People’s Trust for Endangered Species (PTES) adds that water voles are the largest voles in Britain and are sometimes mistaken for brown rats found in similar habitat. It gives the water vole’s head-and-body length as 12 to 20cm, with a tail about half the length of the body, glossy brown or black fur, rounded and almost hidden ears, and a dark, slightly furry tail.
Behaviour offers further clues. PTES says water voles are mostly active during the day and, when disturbed, dive into the water with a characteristic “plop”. Their burrows are dug in steep grassy banks and often include underwater entrances. Females mark territories with latrines, which PTES describes as flattened piles of droppings topped with fresh ones. The comparison is a set of general field features, not a guarantee, and a photograph reviewed by an ecologist is more reliable than a sighting.
Where each animal is likely to be
PTES lists water vole habitat as grassy banks along slow-moving rivers, ditches, streams, lakes, ponds and canals, as well as marshland and upland. Natural England’s planning advice adds that suitable habitat includes soft earth banks for burrowing, wide swathes of soft vegetation growing from banks and in the water, slow-flowing watercourses or clustered ponds of varying depths, and places to escape predators. The Mammal Society lists urban areas and gardens among brown rat habitats, and coastal and marshland areas too, so both species can overlap at the water’s edge.
Legal protection in England
Natural England’s standing advice says water voles are protected under the Wildlife and Countryside Act 1981. It states that it is an offence to intentionally kill, injure or take them, or possess or control them, alive or dead. It is also an offence to intentionally or recklessly damage or destroy a structure or place used for shelter or protection, disturb them while they occupy it, or obstruct access to it. The advice notes that a developer may need a licence, and that absence of a record does not mean there are no water voles, only that survey data may be missing.
For a householder or contractor, the practical significance is that the burrow and the bank are protected as well as the animal. Clearing vegetation or blocking burrows on a stream bank as part of “rat control” could fall within the offences listed above, depending on the facts. That is a matter for an ecologist or Natural England rather than a pest controller’s judgement.
Legal protection in Wales
Natural Resources Wales says the water vole is listed on Schedule 5 of the 1981 Act, and also on Schedule 6, which prohibits certain methods of killing or taking. Its guidance explains that Natural Resources Wales issues licences under the Act only for specific purposes and cannot issue them for the purposes of development. The People’s Trust for Endangered Species adds that water voles are fully protected under section 9 of the Act. Scotland and Northern Ireland are outside the scope of this article, and readers there should consult their own statutory nature agencies.
What this means when booking pest control
- Describe the setting. Tell a contractor if the problem is beside a ditch, pond or stream, so the identification question is asked before work starts.
- Do not use bait or traps near water without identification. The offences above are framed around intentional or reckless acts; identifying the animal first removes the guesswork.
- Get expert help for doubtful cases. Natural England’s advice says a qualified ecologist may be needed, and that survey competence should be checked.
- Use lawful prevention. The site’s guide to rats in drains and sewers and its guide to feeding garden birds without feeding rats cover prevention that avoids harming other species.
Frequently asked questions
Is the water vole the same as a “water rat”? The Mammal Society notes that the “water rat” in a well-known children’s novel is actually a water vole.
Are brown rats protected? The Mammal Society’s brown rat page lists no conservation status for the species in Great Britain, England, Scotland or Wales, unlike the water vole, which it lists as Endangered in England and Wales.
The bottom line
In England and Wales, a rodent at the water’s edge may be a protected water vole rather than a rat. Blunt nose, small hidden ears and a furry tail point to a vole; a pointed muzzle, prominent ears and a long scaly tail point to a rat. Killing, disturbing or obstructing a water vole’s shelter can be an offence under the Wildlife and Countryside Act 1981, so identification should come before any control near a watercourse. This is general information, not legal advice.
Sources
- Natural England, GOV.UK, “Water voles: advice for making planning decisions”
- Natural Resources Wales, “Small Mammal Licensing” (naturalresourceswales.gov.uk)
- Mammal Society, “Water vole” (mammal.org.uk)
- Mammal Society, “Brown rat” (mammal.org.uk)
- People’s Trust for Endangered Species, “Water vole” (ptes.org)