Weedwacker - I had a chipmunk trying to tunnel into my little GH early last spring when the GH was still closed up for winter. I have a lot of chipmunks here with several den sites. The critter didn't quite make it through the gravel floor inside. I set a brick over the entrance hole on the outside and a full water jug on the floor on the inside. Of course, once I open the GH in the spring, the chipmunks are in and out of there every day. Could the pile of excreta be from a different animal? I am going to try sprinkling some Rat Magic (a rodent repellent) around the GH to see if that keeps them from digging.
