YELLOWSTONE NATIONAL PARK, Wyo. (AP) — One man is dead and a 10-year-old boy injured after they were thrown from their horses during a guided trail ride in Yellowstone National Park.

Park officials say some birds spooked the horses in the Tower Junction area Monday afternoon.

Yellowstone officials identified the man killed as 56-year-old Carl Dullmaier, of Gernsheim, Germany. They say Dullmaier had a head injury and he died after he was flown to a Billings, Mont., hospital.

The unidentified boy was taken to a Mammoth Hot Springs clinic with minor injuries.

Also Monday, a bull bison threw a 65-year-old man from Thailand into the air at Mammoth Hot Springs. Meanwhile, a thermal feature near Old Faithful burned a 37-year-old man from Provo, Utah.

Both men were taken to hospitals. Park officials didn't release their names.