In this photo taken Friday, Sept. 4, 2015, tourists climb through dense vegetation and forest to see the mountain gorillas on Mount Bisoke volcano in Volcanoes National Park, northern Rwanda. (AP Photo/Ben Curtis)
In this photo taken Friday, Sept. 4, 2015, tourists climb through dense vegetation and forest to see the mountain gorillas on Mount Bisoke volcano in Volcanoes National Park, northern Rwanda. (AP Photo/Ben Curtis)
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