Wyoming

They run fast and are agile in ways you would not think, can leap over a 6ft fence... seen it myself.

That day, I was talking to some park visitors about elk tussles in Mammoth while looking at an elk bull and a bison bull lounging down at the river bank. While we spoke the elk got up and left. The couple decided to sit on a bench nearby and we kept the conversation going. I noted where the bison was, still lying in the grass waaaay over there. But I was in uniform, which they hate, and I made the MAJOR mistake of turning my back for a moment. Almost as soon as I did that bull was up on his feet and moving full scream ahead in our direction. I got a weird feeling and looked over my shoulder to see he was 1/3 of the way up to us, we were about 100ft from the building, I quickly told them to get inside NOW! We all ran, which is nearly impossible in the uniform boots, and just made it in the door as the bull got within 10 feet of us. I had to run to the other end of the place to the other door and tell the people there to get inside. After they were in they saw why I made them come in. The bull sort of hung around like a predatory shark for a few minutes, left a massive crap in front of the door and then went off into the woods.

It was tense for minute or two. It's also the same place I was on the edge of a stampede, that was really tense.