Squirrel detonation !!!

That's how they plan on ridding parks of the varmints in Spokane.

The Finch Arboretum is being overrun by ground squirrels, and Spokane Parks and Recreation is bringing in some special artillery.
The agency is using a special machine called the Rodenator Pro to detonate some of the estimated 100 to 150 squirrels tearing up the grounds.
......
The Rodenator Pro pumps propane and oxygen into the tunnels of squirrels, then sends an electric spark that causes an explosion. The shock waves kill the squirrels and collapse their tunnels — but in a humane way, the agency said.

Of course they could always use a variation on this method: