YELLOWSTONE NATIONAL PARK, Wyo. (AP) — For the second time in three days, a visitor to Yellowstone National Park has been gored by a bison.

Park officials say a 71-year-old woman from West Chester, Pennsylvania, and her daughter inadvertently approached the bison Wednesday as they were returning to their vehicle at a Yellowstone Lake trailhead. The woman’s injuries were not life-threatening. She was taken by ambulance to a hospital in Cody, Wyoming. The incident remains under investigation.

On Monday, a 34-year-old Colorado man got too close to a bison and was thrown as he grabbed a child. An Ohio woman was gored in May.

Park officials say bison are wild and unpredictable and visitors should stay more than 25 yards away.