Overnight the moles have been busy. Never had them visit before and I hope it is only a visit as I don't want them to be hurt. There is one heap of soil on the lawn which I plan to brush away and three more heaps in the flower borders which I am not bothered about - but were dangerously close to my pond (soft plastic liner). Will the ground sink where it has been? Do moles hibernate in the winter as the soil gets colder?