A 72-year-old Californian woman was gored by a bison in Yellowstone National Park on Thursday, after she “approached within 10 feet ... multiple times to take its photo,” park officials say.

The incident occurred on Thursday evening at the woman’s campsite at Bridge Bay Campground.

She suffered “multiple goring wounds” and, after being treated by rangers at the scene, was flown via helicopter to Eastern Idaho Regional Medical Center in Idaho Falls.  Park officials announced the incident in a news release issued late Monday afternoon.

Yellowstone’s senior bison biologist, Chris Geremia, said it appears the bison felt threatened by how close the woman repeatedly got.

“Bison are wild animals that respond to threats by displaying aggressive behaviors like pawing the ground, snorting, bobbing their head, bellowing, and raising their tail. If that doesn’t make the threat (in this instance it was a person) move away, a threatened bison may charge,” Geremia said.

Park rules require visitors to stay at least 25 yards away from buffalo, along with other large animals like elk, bighorn sheep, deer, moose, and coyotes.

Geremia said to move away if a bison approaches you — “and run away or find cover if they charge.”