Shrubs and brambles at a farm near Bath are being cleared to provide a better habitat for rare bats roosting in the Combe Down mines.
The Greater Horseshoe bat has been in decline in the past century
Opening up the grassland at Clearbrook Farm in Midford will help moths, maybugs and dung beetles - favourite foods of horseshoe bats - to thrive.
The voluntary work is part of the Batscapes Project, which aims to halt the decline of the species.
Project Officer Dan Merrett said the area was a prime site for bats.
"Our plan is to restore the balance so there are smaller patches of scrub for the bats to fly around amongst the insect-rich grassland so creating an improved hunting habitat," he said.
The three-year project is led by Bath & North East Somerset and South Gloucestershire Councils and supported by the Heritage Lottery Fund, English Nature and other agencies.