One of nature’s most social and playful creatures, river otters have big personalities and even bigger appetites. Often seen in groups, they can be observed hunting and frolicking year round at Loess Bluffs National Wildlife Refuge in Missouri. In winter, you might even catch them sliding across the ice on their bellies. Photo by Kenny Bahr. Posted on Tumblr by the US Department of the Interior, 1/25/17.