Postage stamps commemorating Yellowstone National Park and 15 other National Park Service units will be for sale to U.S. Postal Service customers later this year.
The Yellowstone stamp features two bison silhouetted by the winter morning sun.
The image for the stamp was captured in Yellowstone’s Lamar Valley in February 2000 by Art Wolfe of Seattle.
Wolfe said in a news release he found the bison on a frigid minus 30 degree morning as the animals were warming up from the night before.