The Cambridgeshire Fens has a healthy number of water voles and numbers are improving in Essex, despite a national decline according to new figures.
The number of voles across England and Wales has dropped by 30% over a ten year period.
The reserves and waterways around Peterborough and Cambridge are good habitats for the small mammals, especially on the Bourn Brook where the Bourn Free project has run since 2011.
A conservation project to re-introduce the animals on the River Colne and the River Stort has been successful.
The data has been collected over 10 years by a network of experts led by the Wildlife Trusts.
Habitat loss, water pollution and massive building development have led to declines in the voles since the 1960s.
This has been made worse by its predator the North American mink.
The water vole is the UK's most rapidly declining mammal and has been lost from 94% of places where they were once prevalent.
The Wildlife Trusts are calling for the following:
- The creation of a Nature Recovery Network and new Environment Act to protect, link and create areas of habitat which help wildlife move and spread out.
- Landowners to manager river bank habitat sympathetically to help water voles.
- People to find out about opportunities to help survey water voles or manage riverside habitat with local Wildlife Trusts and other groups.