A young woman has been caught on camera being butted off the boardwalk after holding her phone right in front of a bison's face at Yellowstone National Park. The woman appeared to be trying to get a close-up photo of the animal, and seemed completely unaware of just how dangerous they can be when provoked.
Bison, like all wild animals, prefer to avoid close contact with humans but can become aggressive if they feel threatened. Visitors to Yellowstone are warned to stay at least 25 yards (23 meters) from bison at all times.
