Though bison typically avoid contact with humans, attacks do happen on occasion. In 2017, there were two recorded incidents in Yellowstone National Park. In one case, a park visitor suffered minor injuries after being butted by a bison while walking on a trail. The other incident involved a bison chasing a group of visitors who had gotten too close to the animal. There have also been several reports of bison charging vehicles in the park. While incidents like these are rare, they underscore the importance of respecting wildlife and maintaining a safe distance from animals when visiting Yellowstone or any other national park.