YELLOWSTONE NATIONAL PARK, Wyo. \u2014 Love or something like it is in the air for Yellowstone's elk, and getting in its way could be deadly. Rutting season is in full swing, which means bull elk are competing for cows' attention in a display of elk masculinity, charging at each other and locking antlers to prove their strength. It also means bull elk are extra aggressive. They have been known to severely injure humans who get in their way. They run quickly and may change direction without warning. Yellowstone National Park reminds visitors to give elk their space. Maintain at least 25 yards of distance at all times. If an elk charges you, find shelter in your vehicle or behind a tall, sturdy barrier as quickly as possible. Remember, Yellowstone's wildlife is wild. You are responsible for your own safety.