As encroaching infrastructure threatens and shrinks the regions in which wildlife can freely roam, it's becoming more crucial to plan corridors, overpasses and throughways to allow animals to traverse areas that are now crowded with traffic and homes. Y2Y, which stands for "Yellowstone to Yukon," was established in the mid-90s by conservationists and park stewards in order to establish connections up and down the Rockies to prevent habitat isolation. According to the New York Times, "When the researchers write up their findings for scientific journals, they call this goal "functional connectivity," said Michael Proctor, a zoologist and postdoctoral researcher at the University of Alberta. He calls it "sex across the highway."