YELLOWSTONE NATIONAL PARK - For the second time this year a tourist at Yellowstone National Park has been attacked by a bison.

Wednesday morning around 11:30, according to a press release, a 55-year-old man from Norco, California, was taking pictures of a bull bison that was wandering in the Bridge Bay Campgrounds. The two were about 10 feet apart when the bison charged.

The man received what's being called a "puncture" wound to his upper left thigh. He was treated at the Lake Clinic then transported to St. John's Medical Center in Jackson, Wyoming. His injuries are not considered life threatening. His name has not been released.

The first tourist attacked this summer was a 50-year-old woman from Spain who was tossed in the air in the Canyon area. She was talking on a pay phone at the time.

According to park rangers a bull bison can stand six feet tall, weigh up to 2,000 pounds and run up to 30 miles an hour. During the next several weeks they are more dangerous than usual because it's their mating season.

Park regulations require people to stay at least 25 yards away from most animals, like bison and elk, and at least 100 yards away from bears and wolves at all times. Tourists caught being too close can face a citation and fine.