Wildlife photography of five Trumpeter Swans on the frozen banks of the Yellowstone River in Winter

As Winter in the Hayden Valley of Yellowstone National Park ushers in more sub-zero temperatures and deep snow, Trumpeter Swans arrive, making their eponymous calls as they alight on the open stretches of the Yellowstone River. On a particular stretch of the river surrounded by the vast frozen landscape, waterfowl gather and are often seen floating to the end of the open water only to fly back upstream and float down again. This amusing behavior has earned this part of the river the nickname “The Conveyor Belt.”