Get a pipe fitting that goes into the exhaust/muffler hole on your mower. Take the muffler off, attach fitting with a length of rubber hose long enough to go aways down the hole. Pack dirt nice and tight around hose/hole.
Start mower with full tank of gas, let run til empty .. . . .depending on size of "lawn" area, relocate and repeat. . . .

Oh, and you can still sit in a lawn chair and drink beer with this method as well. . . . .shotgun and mattock optional. . .


And Andy, he said shooting them out of his trees, not his dog house. . . . .