NOVA: WILD WAYS to Premiere on PBS 4/20

NOVA: WILD WAYS premieres Wednesday, April 20, 2016 at 9:00 pm ET/ 8:00 pm CT on PBS. Four-lane highways may be a necessity to our modern society, but they can be a death traps for millions of animals that try to cross them. Wildlife the world over need to roam for breeding, foraging, and to carry out their traditional migrations but they are often blocked by ranches, farms, roads and other human-made obstacles.

While national parks and preserves offer some protection to wildlife, even the magnificent Serengeti and Yellowstone parks are too small to sustain healthy populations over generations. But now comes new hope for wildlife through an approach called connectivity conservation. Wild Ways reveals through stunning cinematography how some of the worlds most beloved species ? lions, bears, antelope and elephants ? can be preserved by linking the world?s wildlife refuges with tunnels, overpasses and protected land corridors. From North America's Yellowstone to Yukon, to Southern Africa?s elephant highways stretching across five nations, animals are on the move again in Wild Ways.

Watch a preview below:

Craig Packer (St. Paul, MN), author, Distinguished McKnight University Professor in the Department of Ecology, Evolution and Behavior at the University of Minnesota. He's studied Serengeti Lions for 40 years. His latest book is "Lions in the Balance: Man-Eaters, Manes and Mens with Guns," published September 2015.

Douglas W. Smith, PhD (Wyoming)- Senior Wildlife Biologist at Yellowstone National Park
David Quammen (Bozeman, MT)- author and journalist of 12 books