A massive bison lunged at a Yellowstone National Park tourist after the woman tried to pet it. She managed to escape but stumbled in the process. Fortunately, the bison did not charge at her. In another incident, a man was seen holding a baby bison, thinking he was helping it catch up to its herd. However, his actions violated Yellowstone rules which prohibit visitors from getting within 75 feet of wildlife. The calf was euthanized after the herd repeatedly rejected it.