Is that a.... Groundhog?

I was on a walk with Peter and Elsie a couple mornings ago and just as we reached our neighbor's house, I saw something in their driveway. I stopped, and stared. I knew right away it wasn't a cat or bunny, but the process of elimination continued. No, it's not a squirrel or beaver or weasel; too big to be a prarie dog. It must be a... groundhog? Out here in the West we don't see too many of those. However, I began to get pretty excited, after all, it was pretty cute. I pointed it out to Peter and he and I began to follow it around the driveway. It eventually hid behind a small wood pile of theirs, so we walked on home.
I eventually called the neighbors, and told them I thought they had a groundhog in their front yard. I could hear the skepticism in his voice, but he said he'd check it out. Come to find out, it wasn't quite a groundhog, but a rock chuck. Well, I needed some clarification, so I went to the trusty internet. Aparently, woodchucks and groundhogs are the same thing and found mostly throughout the east half of the country. From what I could gather, rock chucks are very closely related, but found here in the west. Well, my great neighbors, being the humane people they are, caught the rock chuck and took him up to a nearby canyon. It made for an unusual day!