Remnants of old forestry clearcuts as well as forests cleared to create ski runs at Big Sky Ski Resort in Montana cover nearly 7,000 acres. "It is one of the largest facilities dedicated to outdoor recreation in the world," Servheen writes. The Big Sky community is located in the Madison Mountains which would otherwise be a well-used corridor for wildlife movement east to west and north to south. As the number of people in Big Sky grows and the development footprint intensifies, with spillover effects onto adjacent public lands, scientists say habitat loss for wildlife is a serious issue in that part of the Greater Yellowstone Ecosystem. Photo courtesy Calvin Servheen