Who keeps walking on my roof?

This groundhog lives under the pathway to one of the portable structures on campus. He pops up now and again from his hole to see what's going on. Usually it and the wee ones are seen munching dandelions and other weeds. The hole may have been originally dug by a skunk. I used to see one there from time to time a couple of years previous. We also have a tame groundhog elsewhere on campus. He likes muffins. You can see him here.

Back-blipped 12 March 2011.