Yellowstone National Park Spokesman Al Nash is warning people wishing to witness the annual mating ritual of elk this time of year, that Bulls are much more aggressive toward both people and vehicles and can be a threat to both people and property. Nash says several vehicles are damaged by elk every year and occasionally people are charged by elk and are injured. He says park officials have frequently seen very aggressive bull elk behavior, especially in the Mammoth Hot Springs area. The attraction, he says is now to the point where some visitors choose to come in early fall because of the spectacle of elk around park headquarters. Other animals will be foraging for food around the lower elevations as many prepare for their long winter’s nap. Whether it’s elk, bison, bears or one any of the other numerous large animals that call the area home, Nash reminds that park regulations require visitors to stay a minimum of 25 yards – the length of two regular school buses – away from most large animals; and a minimum of 100 yards – the length of a football field – away from bears and wolves at all times.