Yellowstone may be the only place in the United States where never-domesticated, free-range wild bison still exist. Other herds in the country had been eradicated and then reintroduced back to the land.
Bison, sometimes called buffalo, are everywhere in Yellowstone including the roads! If you encounter a bison on foot, stay a safe distance of 25 yards. In a car, have patience and calmly make your way when there is an opening. Most of all, enjoy this spectacularly rare experience.