americasgreatoutdoors:

A group of river otters is called a romp. Commonly found in the South, Great Lakes region and in the Pacific Northwest, this romp was spotted hanging out at Red Rock Lakes National Wildlife Refuge in Montana. While they engage in playful behavior with each other, they are deadly hunters and can be dangerous when their territory is invaded. Please enjoy watching them from a distance. Photo by James Perdue, U.S. Fish and Wildlife Service, @usfwsmtnprairie.