I'm not sure what they were doing. This scene went on for over ten minutes. I would guess it was for mating purposes, but I can't be sure. I would appreciate anyone with knowledge of marmots posting more info on what they are doing.
"So I was sitting in my cubicle today, and I realized, ever since I started working, every single day of my life has been worse than the day before it. So that means that every single day that you see me, that's on the worst day of my life."
--Peter Gibbons (Office Space)