Holes in your yard from a skunk are usually a few inches ... it away from the hole—leaving no mound around the entrance.
Groundhogs prefer to live near pastures ... A common sign of skunks is the presence of 1 to 3-inch cone-shaped holes all over your lawn where skunks have foraged for grubs and worms.
Spotting a groundhog: Look for physical attributes, burrows, tracks, and scat, and observe their behavior and posture.