An antelope running across a road knocked a couple off a motorcycle as they drove through Grand Teton National Park.

Park officials say 38-year-old Brady Burgess, of Garland, Utah, was driving the bike and had just passed a motor home at 65 mph when the antelope leaped and struck the motorcycle sideways Saturday. The animal knocked the couple off the bike, which fell over and slid 100 feet down U.S. 26/89/191.

Forty-six-year-old Koreen Burgess was transferred Sunday from St. John's Medical Center in Jackson to University of Utah Health Sciences Center in Salt Lake City. Her condition wasn't immediately available.

Burgess was in good condition at St. John's.

The accident closed the highway for an hour.