Not sure what you have. I found a big pile of dirt outside my perennial flower bed today. The hole is maybe 3 inches around and appears to be similar size to a chipmunk burrow I know they have elsewhere in the yard. I'm thinking maybe dynamite. I'm sure Bill Murray would agree
Edit: Hey I like that pitchfork idea. I don't have one but I do have a garden fork with some heavy duty tines on it.