Over the past five years research at the Game Conservancy Council's experimental farm at Loddington, in Leicestershire, has shown that ground beetles, rove beetles and spiders spread out as far as 200yds on either side of the banks, and eat a worthwhile number of pests. The thick, tussocky grass, which is never cut, has also proved congenial to partridges, which nest in it, and to harvest mice, which take up residence on the banks. This, in turn, is of benefit to kestrels, which can often be seen hunting overhead.
Planting wild flowers such as oxeye daisies and knapweed has attracted hover flies, parasitic wasps and bumblebees, all of which are beneficial. Humble artefacts though they may be, beetle banks are doing a good job.