In the winter of 2005, the Essex Biodiversity Project provided financial support and technical expertise to the River Colne Countryside Project in their initiative to build bat hibernacula. (Hibernacula are suitable places in which bats can hibernate during the winter.)
We converted two World War 2 pill boxes into hibernacula in the River Colne valley. This involved adding metal doors to prevent any intrusion by people or other animals and to help keep the temperature constant and the installation of special 'bat bricks', designed with bat-friendly holes.
For further information, please contact Simon Amstutz.