Thanks to a reader for sending:
“My husband spotted this little guy as we were awaiting the metro yesterday. The groundhog has made his burrow on the hill to the right of the sign where you can see him sitting at the entrance. He blends in a bit with the brown earth. Perhaps other readers have spotted him.”
Looks like a corpulent squirrel to me but I’m gonna take your word for it :)
Update: Thanks to another reader for sending a close up!