He totally disappeared for a while in August, but then, came back for crab apples in September, October, and over half of November.

With the deer (that the groundhogs hate) now aggressively competing for the crab apples falling on the groundhog's woodpile, the remaining 3 groundhogs have become increasingly wary of their surroundings. An extended period of freezing weather is predicted for the next few days. So, it's probably now hibernation time. Although still little, Lumpy has fattened up like his littermates.