Could also be raccoon--they look a lot alike and I don't know how to tell the difference.
We have had a lot of poop piles in our driveway lately, whatever it is takes a dump there every night.
But, I have found 2 nests in the ground harboring wasps and bumble bees. The first time I saw where a hole had been dug, maybe 5" across and 4" deep with a structure like a honeycomb exposed, similar to the paper wasp nests we get under our eaves.
The second one I found the hard way--see my thread, "Got nailed twice in 2 days".