I am betting skunk since it is digging, probably for grubs.
As for the walnut trees somebody was asking about, Walnut is a great hard wood. It is used for cabnets and the limbs make great firewood. If they were straight trees and fairly big with usable sections of say 6-8' I would cut them down and have somebody cut them into usable lumber. You can find people with portable sawmills that will come to you and cut them up. Black Walnut tree's are the bomb, Lovely colored wood.
Great looks like I will be buying a trap sooner rather than later. I'll see what tonights webcam recon produces first lol