Pronghorn in front of the Tetons: Over millennia pronghorn have moved between summer range in Grand Teton Park and lower-elevations in winter where they can escape deep snow. With navigational way-finding passed down from mothers to young across generations, the corridors they use pass through mountains, across rivers and openings in topography. If those routes get plugged by human development, migrations can be severely impacted.. Photo by Franz Camenzind