Delicate frost clings to a solitary tree at J. Clark Salyer National Wildlife Refuge in North Dakota. These little details are easy to miss when visitors are busy bird watching, hiking or ice fishing. Extending from the Canadian border for 45 miles, it’s the largest wildlife refuge in the state and one of the nation’s premier birding locations. Photo by Colette Guariglia, U.S. Fish and Wildlife Service.
Sig Nordal, Jr. 