Park officials not that it's very common for cow elk to aggressively defend newborn calves and hide them near buildings and cars.
Park officials say some in the crowd came within 15 feet (4.6 meters) of the bison when the safe distance is at least 75 feet (23 meters).
When the bison crossed the boardwalk, it became agitated and charged at the crowd and gored Hancock. The animal then immediately left the area, park officials said.
Hancock was treated for a hip injury and taken by ambulance to a hospital in Montana.
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This is the second incident of a bison injuring a visitor this year.
A crowded boardwalk in the Lower Geyser Basin in Yellowstone National Park on August 18, 2015. A cow elk injured a 53-year-old Texas woman on Tuesday. On May 2, a 72-year-old Idaho woman was butted in the thigh, pushed and tossed off a trail by a bison near Old Faithful.
Yellowstone requires that visitors stay at least 25 yards away from bison and elk and 100 yards away from bears and wolves.
We have another yet another Yellowstone wildlife incident to pass along, as a California woman was gored by a bison after a crowd gathered around the bull at Fountain Paint Pot. "Give animals space when they're near trails, boardwalks, parking lots, or in developed areas". There was another attack in 2017, none in 2016 and five in 2015. "If you can't maintain these distances, turn around and find an alternate route".