In summer last year The Wildlife Trusts found evidence of the small mammals in Potton Brook while completing a survey.
The brook runs through the Henry Smith Playing Field.
Volunteers are required to clear the bank in this field as it is currently overgrown with brambles, nettles and saplings.
Once these are cleared more grass will be able to grow and this will provide a better habitat for the endangered species.
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Volunteers will spend a couple of hours clearing the brook on Sunday (November 27) from 10am.
Equipment will be provided but volunteers are asked to bring along their own gloves and secateurs, hand pruners or garden saws if they have them.
Outdoor clothes and sturdy shoes are advisable.
If you would like to find out more contact Hannah Bartram at [email protected] or call 07743 841420.
To read the full story see the Biggleswade Chronicle of Friday, November 25.