Last year something kept digging up one or two area's of my lawn, peeling back and flipping over large chunks of turf. Last night....it came back, with avengance, a large area has once again been attacked.....but funnily, it's the same area as last year. I have no idea what is doing this, can anyone shed some light. I live in Wheaton, MD, large yard, in the vicinity of the regional park. Thanks.