Discard the idea that you have to be in Africa to go on safari. Instead, head for the “Serengeti of North America”—the Greater Yellowstone Ecosystem—which is spread across the states of Wyoming, Montana, and Idaho. Grand Teton and Yellowstone national parks form the heart of this 34,375-square-mile swath, which packs in more wildlife than anywhere else in the lower 48 states and egionepresents one of…