Every year, several people are injured by getting too close to bison in Yellowstone National Park.
Last year, five people were gored by bison, and four of them had to be airlifted for treatment of their injuries.
Park officials have warned visitors to never crowd or attempt to touch park wildlife, and say that wild animals should not be approached, regardless of how tame or calm they may appear.
When an animal is near a trail, boardwalk, parking lot, or in a developed area, visitors must give it a wide berth and not approach it closer than the required minimum distances: 25 yards away from all large animals - bison, elk, bighorn sheep, deer, moose, and coyotes and at least 100 yards away from bears and wolves.
Park staff note that bison -- the largest animals in North America, weighing up to 2,000 pounds -- can run three times faster than humans can sprint, and are unpredictable and dangerous.
Visitors are advised to give the animals enough space and alter their plans to avoid interacting with an animal in close proximity.
Things are already getting Crazy here in Yellowstone. Check out these visitors taking a selfie with a bison and even petting it! Never approach wildlife and the minimum legal distance to Bison in Yellowstone National Park is 25yds.