A bison has gored and significantly injured a US woman in Yellowstone National Park.
The attack happened in a field near Lake Lodge on the north side of Lake Yellowstone, park officials said in a statement.
The 47-year-old woman from Phoenix, Arizona, was walking in the field with another person when they saw two bison. The people turned to walk away.
One of the bison then charged and gored the woman, causing significant injuries to her chest and abdomen.
She was taken by helicopter to Eastern Idaho Regional Medical Center in Idaho Falls, Idaho.