Of course many years ago I saw the bison in the Lawton, OK, area, but I'll also never forget when I was a teenager and Ardmore, OK, tried to get a zoo started at the county fair grounds. One of the exhibits was a cow, calf, and bull bison in a chain link fenced pen. I walked up to the fence and the calf was right on the other side of the fence. I didn't try to touch the calf or anything like that, and the adults didn't "charge", but the bull slowly walked toward me (I thought maybe to see if I had something for him to eat) and when he got about a foot from the fence, he lowered his head, and just walked into the fence and moved both me and the fence back 3 or 4 feet. Needless to say, I very promptly decided to put a lot more distance between me and that bull.