Ah the interesting theories begin to fly after 10 pm!
I vote for the whack-a-mole.
If you decide to fire at the mound, you'll want to make sure the neighbors are away, or the nice men carrying the white coats with long arms that tie behind you may come knocking at your door.
wait! dont burn it.. i swear there was a case in the local paper about some gal on the town council who got her neighbor ticketed for BURNING VARMINTS. i swear its true. apparently freshly roasted ground hog smells bad.
Well, I sorta whacked it by jumping up and down on it to see if it was of different texture.
I don't want to cut the plastic yet, or shoot holes in it, as I want to make really sure the bermuda is dead. Oh, wait. Maybe it's Bermuda, a HUGE, 3 foot by 8 foot by 2 foot patch of rebel bermuda has organized under the plastic and is coming for me.....!
I say it is a groundhog....do you have them there? You can get smoke bombs for them, at least that is what the farmer neighbor told me recently to use to take care of my problem in the spring.