April 15, 2019, inside the Sweetwater National Wildlife Refuge in Sweetwater County, Wyoming, U.S. (Image from IC photo)

A North American otter strolls along the Green River in spring. (Image from IC photo)
River otters are common among wildlife refugees, but are difficult to see because they are afraid of humans. (Image from IC photo)
A herd of forkhorn antelopes forages on the sage grasslands of the Xizi Kadi National Wildlife Refuge. (Image from IC photo)
A striped skunk forages at the West Kady National Wildlife Refuge in Sweetwater County, Wyoming, in the spring. (Image from IC photo)
A forked horned antelope stands on the sage steppe. (Image from IC photo)