Footprints in the Dirt

So I had an overnight guest in my planter box. Could have been a cat, might have been the opossum who lives around here, or maybe some other small night creature. Whatever it was, he/she left little footprints behind. Had my tomatoes already been in the box I might have been a bit miffed at this mystery creature, however, no harm was done, so it's rather amusing at this point. Whatever it was walked the total length of the planter box - one side, 90-degree turn, and then the other side. If I had my guess I would say this was a curious kitty, as the opossum probably would have rooted around a little bit. I'd like to somehow blame this on a pesky squirrel but the only way these would be squirrel prints is if the little guy decided to sit every six inches and leave behind his "be-hind" print.

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Mystery footprints in the dirt

What or who might this be?

I'll be on the lookout for this little squirt

I should probably look in the trees!