Get a live animal trap. See the "free range cats" thread. I got a trap for cats and ended up with a young skunk. Seems they onyl spray when startled. When I caught the skunk, I talked to it from far away and crept up on it and then let it out--he was really curious. Not sure what you would do with it once you caught it--ha, maybe the trap thing isn't a good idea after all!
Any idea why they are comign in your yard? Are they coming at a certain time? Woudl settign sprinklers when they come help? How about getting a ninja squirrel to protect your boundaries???
_________________________
Dabbling in banking, law, accounting...the life of a trustee.