The tourons have already been spotted at Yellowstone this season, so it's no surprise that the National Park Service felt the need to school the masses again.
A couple was recently filmed appearing to be running from a large bison herd. What comes to question though, is why were they actually running "with" the massive animals?
Trying to get closer to bison is dangerous for many reasons. It's obvious these are large animals, but they're also wildly unpredictable. Yellowstone tourists learned this lesson the hard way a few weeks ago.