Crushing visitation has also fueled an expanding human footprint outside the park, such as in Gardiner, Montana, northern gateway to Yellowstone, pictured here. More development at the edge of Yellowstone further constricts the ability of wildlife to move in and out of the park. And sold-out campgrounds and hotels in the park mean more people are turning to Forest Service campgrounds and that means more recreation pressure. Photo courtesy Jacob W. Frank/NPS