Yellowstone National Park pronghorns migrate out of the park taking the Rescue Creek Trail to the Gardiner Basin and the Paradise Valley to spend the winter.
Pronghorn antelope undertake some of the longest animal migrations in North America, many of which are now blocked by roads and fences.
What some people call antelope are actually not a member of the antelope family found in Africa and East Asia, instead the North American species is called a pronghorn.
In addition to removing old fence that is no longer needed, the NPCA also replaces fencing that makes it easier for wildlife to go over or under.
Workers help the National Park Conservation Association modify a fence to allow pronghorn passage during a May workday on a ranch in the Paradise Valley. So far the effort has removed or modified 18 miles of fence in the area to allow the wildlife to migrate from Yellowstone National Park to traditional winter range in the valley.
A volunteer on a project at the Bureau of Land Management’s Carbella fishing access site removes old fence last fall that was replaced with fencing more compatible to wildlife.
Cars enter Yellowstone’s East Entrance in this file photo.
Park visitors stop to photograph a mother grizzly bear and her cubs on June 4 at Yellowstone National Park. A proposed U.S. Forest Service rule would require all commercial photographers and videographers to obtain a permit to work in wilderness areas.
As night falls on Mammoth Hot Springs, elk bugles ring out in every direction. Three or four bulls trot past the glowing windows of Officer's Row, converging near the southern end of Fort Yellowstone. Suddenly two begin a fight for dominance and access to females, the entire display lit by cars making a late exit from the park. Natural sounds only: no narration. Please note: intentionally spotlighting animals is prohibited by law.