Squirrel IDs, USA (1 Viewer)

These were taken someone else. Could have sworn I already posted them before, but my posting history shows no matches.
The first one is from New York City, the second from somewhere in Michigan. Both are from August 2008. Third one is from August 2012, I believe from Minnesota.

I've tentatively identified the first one as an Eastern Gray Squirrel, the second as a Fox Squirrel, and the third one as a Groundhog, but due to the rather large roster of squirrels inhabiting North America, and myself not being able to observe them in person, I thought it prudent to ask for second opinions.

The first two pictures are automatically resized, the third one heavily cropped. As always, I would be grateful for any assistance.

- Andy

First two are correct for sure; the third, I am almost sure, is indeed Marmota monax (alias Wiarton Willie, alias Punxsutawney Phil), but Minnesota is quite a bit west of where I live, so I suppose there could be other fat rodents out there...

Thank you :t: Seems like I'm getting better at IDing mammals from the region.