Volunteers across Devon are being called to help save one of Britain’s fastest declining mammals, by taking part in a nationwide water vole survey which runs until 15 June.

Wildlife charity People’s Trust for Endangered Species (PTES) runs the annual survey which requires volunteers to visit a local waterway and record their findings online at www.ptes.org/watervoles.

The survey is part of PTES’ national water vole monitoring programme, launched in 2015 to try and combat the decline in water vole populations.

Water voles underwent one of the most serious declines of any wild mammal in Britain during the 20th century, but with the help of volunteers their fate can be turned around, says the charity.

Emily Sabin, PTES’ water vole officer said: “Arguably the best-known water vole is Ratty from The Wind in the Willows.

“Yet, despite his prominence water voles continue to experience an ongoing decline, are listed as Endangered on the Red List for Britain’s Mammals and are now facing extinction in Britain thanks to historical agricultural intensification, habitat loss and fragmentation, and predation from non-native American mink.

“We’re asking volunteers to find their nearest stream, ditch, river or canal, and look out for water voles, listen for their characteristic ‘plop’ as they dive into the water, or see the signs they leave behind - from footprints and burrows in the riverbank to feeding signs and droppings.

“Any sightings or signs of American mink should also be recorded.”

Water voles have glossy dark brown fur and a blunt snout with small, black eyes.

Their ears are rounded and almost hidden, and, unlike rats, they have a furry tail.

They were once a common sight along Britain’s inland waterways, but loss and fragmentation of suitable habitat, combined with the arrival of non-native American mink in the 1980s and 1990s, has resulted in their catastrophic decline.

Emily continued: “Last year 216 sites were surveyed, with 85 showing signs of water voles. This builds on 2021’s data, where 116 sites were surveyed with 47 indicating water vole presence.

“We really hope even more people can take part this year to help us further understand how water voles are faring.”

She added: “No prior experience is needed, and we’re offering free online training and Zoom talks so that anyone can find out more and hopefully get involved.

“There are over 400 pre-selected sites volunteers can choose from, and if there isn’t a site nearby new sites can be registered.

“We have hundreds of fantastic volunteers who survey water voles for us every year, but given the severe decline water voles have experienced, more help is always needed.”

The data gathered enables the charity’s conservationists to see where water voles are living and where they are no longer living, which dictates where conservation efforts need to be concentrated.

Data from the survey’s eight-year history also show how populations are changing at a local level year on year, which adds to the nationwide and long-term picture of how Britain’s water voles are faring.

PTES’ National Water Vole Monitoring Programme builds on previous work by the Vincent Wildlife Trust and aims to ensure water voles become commonplace once again.

To access the free online training, to sign up to one of PTES’ free Zoom talks or to find out more, visit www.ptes.org/watervoles