In September I spotted a litter of North American river otter kits slinking through these woods from one small lake to another. Their mother had used an abandoned beaver lodge for their den. Based on these slide marks it looks like three of the kits are still hanging together using their back legs and belly to scoot through the snow toboggan style.
You do find some interesting things to photograph! How did you know these tracks were belly impressions of an otter? Amazing. Hugs, Marilyn