Every autumn in northwest Wyoming, the earth trembles with pounding hooves. For thousands of years pronghorn have been migrating from the high meadows of Grand Teton National Park to their winter habitat in the upper Green River Basin. It’s an astonishing 100-mile trek that North America’s fastest land animal can complete in just three days. But today’s pronghorn face a more perilous route than their ancestors did. Highways, housing developments and barbed wire fences inhibit their travel and threaten their lives. Conservationists have gotten creative in their efforts to preserve the ancient migratory path of the pronghorn.

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