I give up!
The ground hog has won for this year again!
It has persevered - returning and returning despite my plugging the holes it dug, to dig a front and back entrance for itself under our deck.
This hole at one end of the deck was not here this morning.
Don't know if its the front or back entrance but the other hole is at the other end of the deck.
It wasn't here this morning either.
No more plugging! I'll leave the battle to the buyers of this house.