Two more visitors to Yellowstone National Park have been attacked by bison and remain hospitalized, brining the total to four attacks in the park this season. A 68-year-old Georgia woman was gorged on Wednesday when she encountered a bison while hiking. She was transported to the hospital by ambulance. On June 23, a 19-year-old Georgia teen was charged and tossed into the air but only suffered minor injuries. The other injuries were to a 62-year-old man and a 16-year-old girl. Both were seriously injured. Four attacks in two months is unusual for the park, which typically sees only one or two incidents per year.