Stilly, I agree about lead poisoning. The cops and the city, however, frown on it. Otherwise I'd just use a .22 or an air rifle.

But...I have a friend who is a legal trapper and supports his family partially by the pelts he sells and the money he makes trapping for various ranchers. He's very ethical and may have another suggestion. I'll ask him.

I could be persuaded to do nothing, except that the tunnels run downhill from my lawn to the golf course and I don't want my backyard to develop a bad case of erosion.