National Park Service warns about agitated bison during mating

A Minnesota woman was severely injured by a bison in Theodore Roosevelt National Park in Medora, North Dakota, according to the National Park Service. It's the second instance of a bison injuring a person in the past week. A bison gored a 47-year-old Arizona woman Monday morning in Yellowstone National Park in Wyoming. In the wake of the two incidents involving national park guests within days of each other, the National Park Service has issued a warning that bison can be easily agitated during mating season. "Bulls can be aggressive...