Tonight, these are the heart-stopping moments. A grandfather was attacked by a bison at Yellowstone National Park. The dramatic video posted online by a professional photographer shows a bison, which can weigh more than 1,500 pounds, charging after the 65-year-old flipping him into the air. You see the man and his grandchild stop to take photos of the bison. Seconds later, the massive mammal, then charges, chasing the family around trees before the man is thrown multiple feet into the air, seriously injuring him. Another video shows the bison running past tents at a campsite before the incident. The grandfather is lucky to be alive. Millions of people visit Yellowstone every year to see the park's famous wildlife. Unfortunately, this is not the first time we've seen bison charging tourists. As for that 65-year-old, he was hospitalized and is recovering from his injuries. Yellowstone National Park warns people to keep at least 25 yards away from bison at all times. And if too close, you are warned to retreat immediately. They said that this grandpa, Grandpa Carl,