I had one of them digging tunnels under my barn. They made their entrance where there was plant cover, and always dug at night. Removing their cover (stairs in this case, not permantenly of course) and having a light on will likely deter them from coming around. I have since removed all plant cover on the side of the barn, installed a new brigher yard light, and put down fox urine granuals. The smell of that **** is enough to keep damn near any critter at bay. Its been 2 months since any ground hog activity has taken place. Keep filing in the hole. It will agrivate them and also make them consider new locations to burrow.
