For the second day in a row in Yellowstone National Park along the Yellowstone River, we encountered a family of River Otters, watching as they played in the water, submerged and reappeared on the opposite side of the bridge, and popped up out of the water to see what was going on around them. Popping head up out of the water is a movement I have learned is called periscoping as this pair is demonstrating. They seem to frolic in and under the water and in the snow with pure joy. I am utterly enamored with otters.