I’ve been giving this some thought and have a possible. Some years ago, on new ground, netted around 20 holes along a ripped out hedgerow. Put a box at either end and dropped well experienced ferrets, again at each end. Within minutes I had one of them running and screaming like a banshee. I took off after her caught her but by heck she wasn’t happy. Back to the warren. 2nd ferret had moved to where the 1st had bolted and I ended up digging. Vixen with cubs. I suppose that would put a ferret off. Jok.