Here is what I decided:
One fox came from the direction of the highway on the river ice, then cut into the yard in front of the house next door.
It crossed over to my side yard and came up near the dining room window where I put out the food.
Several other animals, either foxes or coyotes, came along the river ice and up the river bank to the feeding spot. They left toward the mountain behind us, where our regular fox always came from.
Tonight, I will sit next to the window in the dark and try to see who shows up.