A video shows an elk charging at a woman who was trying to take its picture in Yellowstone National Park.
A male elk can weigh as much as 730 pounds, and a female elk can weigh more than 500 pounds.
The video was captured by guide Jody Tibbitts.
Yellowstone National Park’s rules stipulate that if you see wildlife, you must stay at least 25 yards away. For bears, it’s 100 yards.
ABC News reported that the woman in the clip was apparently trying to take a selfie, but other reports said the woman was trying to take the elk’s picture.
Tibbitts said that a woman who wasn’t with his tour group quickly approached the elk on foot and was apparently holding a mobile device, CNN reported.