Each fall, thousands of pronghorn make an impressive migration southward across Wyoming, traveling 93 miles (150 km) to get to their wintering grounds in the Upper Green River Basin. The most dangerous part of this journey may not be predators or a lack of resources, but an all-too-familiar obstacle: traffic
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To help the pronghorn cross a major road that bisects their path, U.S. Highway 191, state officials in 2012 built two overpasses and six underpasses to accommodate the animals.
Scientists with the Wildlife Conservation Society (WCS) monitored this year's fall migration and declared a second season of success, reporting that this time around, the pronghorn showed no hesitation in using the crossings.
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