It is widely assumed that Yellowstone National Park is a year-roung sanctuary for wildlife, a landscape that protects animals within park boundaries from human impacts. But the Park alone can neither contain nor sustain many of the wide ranging species that people generally associate with it. Populations of large mammals, raptors, waterfowl and many other species require space far beyond park boundaries during at least part of each year, to secure the resources necessary to survive and reproduce. To these creatures, the boundaries of our parks, forests and ranches are invisible. 79 pages. Soft cover 1605.