Someone had been here.
I looked around, to see who could have made these prints, and -- lo, and behold! -- there stood DustBunny, lost and bewildered by this phenomenon.
Well, DustBunny is one of the more feral kitties to have been born in my garage, so she's not overly friendly toward people in general -- let alone toward me (I think there's only one person on the block who is allowed to touch her, and that's my next-door neighbor, Janis, who sits quietly on her back step for very long times in the evening). Even when I pour out a giant heap of kibble, DustBunny tries to stay in the background, unnoticed, until I either go back indoors for a while, or I drive away in my car, heading for Mom's computer. But, this time, poor DustBunny had no way to camouflage herself against the white, white earth and the white-laden branches of the spirea bushes by the porch.
Still, I didn't approach her. She eventually came up & drank some of the warm water, and dashed across the porch to hide in the pack that was already pigging out on kibble in the Fiesta ceramic bowl (so, okay, Dustbunny wasn't the only cat making pitty-pawprints in the snow. She obviously had help from siblings and cousins).