Keywords: Lontra canadensis, National Park, North America, North American, Yellowstone, adult, animals, aquatic, cold, dive, diving, eat, eating, family, fish, fishing, forage, foraging, fur, groom, grooming, ice, lontra, lutra, mammal, mammals, mustelid, northern river otten, northern river otter, otter, otters, river, river otter, roll, rolling, rub, rubbing, semi, semi-aquatic, snow, snowy, swim, swimming, water, white, wildlife, winter, young