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Joe Riis

Mule deer crossing a river in Wyoming. This is one of a growing number of animal species that can become infected with SARS-CoV-2.

A baby mule deer (Odocoileus hemionus) takes a leisurely stroll at Eagle Pass, the southeastern side of Yellowstone National Park, Wyoming.

A grizzly bear (Ursus arctos horribilis) is pictured in Wyoming. Grizzlies once lived in much of western North America and even roamed the Great Plains.

Fencing, an important component of successful wildlife crossings, directs migrating pronghorn antelope in Wyoming over the highway instead of across it at Trapper's Point. (See more pictures of the pronghorn crossing here.)

A remote camera captures a bull elk migrating through Wyoming.

A remote camera captures a bull elk during migration in Wyoming, USA.

On their first migration to their summer range in southeastern Yellowstone, three-week-old calves of the Cody elk herd follow their mothers up a 4,600-foot slope. This photo was originally published in "The Yellowstone We Don't See: A Struggle of Life and Death," in May 2016.