North America, Northern River Otter, Northern River Otters, North American river otters, North American river otter, Lontra canadensis, River Otter, River Otters, Western U.S., Wyoming, montana, Yellowstone, Yellowstone National Park, fauna, lake, otter, otters, pond, predator, predators, carnivore, water, wetland, wetlands, wildlife, horizontal, Tom, Pat, and, &, Leeson, leesonphoto, Common Otter