Since 1980, bison have injured more pedestrian visitors to Yellowstone National Park (Yellowstone) than any other animal (1). After the occurrence of 33 bison-related injuries during 1983–1985 (range = 10–13/year), the park implemented successful outreach campaigns (1) to reduce the average number of injuries to 0.8/year (range = 0–2/year) during 2010–2014 (unpublished data, National Park Service, September 2015). During May–July 2015, five injuries associated with bison encounters occurred (Table). Case reports were reviewed to evaluate circumstances surrounding these injuries to inform prevention.
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