Thanks for a wide range of expertise, the web links, and especially for the words of caution with the FPS rule in Illinois. I should have done my homework but there has been no harm done up until now. At the very least, you all have provided me some sound advise on the right kind of equipment to get these critters. If the air gun is a 'no no' I'll trap the remaining two babies and then get back there and bury a small grid, heavy guage wire mesh and run it down the fence and across to the shed and up the shed about 1' and just monitor it until they give up I guess.
Or, maybe I'll wait for the 4th of July when I can take two full tilt shots with my Model 66-2 snubby