Yeah, those fluffy cows can be mean! The bison rut is underway at Yellowstone National Park. The mating season runs from June to September, but July and August is when the animals are most on edge. Listen for deep bellows, watch for bison rolling violently in the dust, and keep an eye out for male-male clashes across the wild North American landscape as males try to assert their dominance. And keep your distance! Always stay at least 25 yards from bison and elk and 100 yards from all other wildl