In an area along the Yellowstone River, just across the Montana border from Yellowstone National Park, there is a tiny sign at a Highway 89 turnout that most visitors miss. Every winter, the largest wildlife migration in the lower 48 states leaves Yellowstone and passes this point, returning to the park in the spring.
The numbers are astonishing. In October, about 500 pronghorn antelope make the trek from mountain valleys to sn
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