The charity has created the 850-metre boundary to keep cows and sheep grazing for a perfect habitat.

Butterfly experts are celebrating the completion of an £8,000 project to help Chalk Hill Blues, Brown Hairstreaks and Grizzled Skippers in Somerset.

National charity Butterfly Conservation has erected the new 850-metre boundary around its Stoke Camp nature reserve in the Mendip Hills.

The fence is not to keep butterflies on site, but the all-important cows and sheep that graze the vegetation and create perfect habitat for a host of rare and vulnerable species.