How about dry ice on/in the burrows. Carbon dioxide settles and they are already buried.Have a good link for one of these? I need something for the rock squirrels that have been undermining my house. I haven't had much luck trapping and they just keep mining away. Can't gas them out because it's under the house; I'd do that with an outbuilding. Any and all suggestions gratefully accepted. Wife and city say I can't use my Glock Mod 45.