National Parks Tracking People

by Breannan Linsley
| June 19, 2015 3:46 PM

A family hikes in July 2014 at a scenic overlook off Trail Ridge Road in Rocky Mountain National Park in Colorado. Rocky Mountain has given Global Positioning System devices to visitors to improve shuttle service. Scientists are putting tracking devices on people as they try to learn more about how human movements affect ecosystems in national parks. (AP file photo)