I've never seen one quite like this. Our armadillos do more like a snowplow, the possums and skunks never go deep. This ~6" diameter hole is almost straight down with symmetrical sidewalls and 8" to the bottom. Like this critter pulled a plug out of the ground. It was done overnight Tuesday. It didn't come back for more last night. It's at the end of a wide aisle between rows. Any ideas?