Bison jams, which occur when bison are on or close to the road, are quite a common site in YNP. The more exciting involving many bison on the road right near your vehicle and the more frustrating ones sometimes involving miles of cars backed up because of habituated animals using the roads as travel corridors. This instance was a little different in that it was dark and the bison were a little more excited due to the park ranger making noises at the animals to clear the road. I snapped this photo just before the red and blue lights were turned on. This photo was taken from inside the safety of a vehicle.
The American bison , also commonly known as the American buffalo, is a North American species of bison that once roamed the grasslands of North America in massive herds. Their range once roughly comprised a triangle between the Great Bear Lake in Canada's far northwest, south to the Mexican states of Durango and Nuevo León, and east along the western boundary of the Appalachian Mountains. Because of commercial hunting and slaughter in the 19th century, the bison nearly went extinct and is today.. more