Tracks
One of my favorite things about having snow on the ground is being able to see the tracks of whatever creatures visit. When I first moved here about 20 years ago, seeing deer tracks in the snow was exciting. Deer sightings were a rare event.
Now they're so common, I'm surprised when I don't see deer tracks the morning after a snowfall. That's not a problem right now -- the frozen pond right now is simply covered by their tracks!