Bison Headbutts Car in Yellowstone National Park

We went to Yellowstone this summer and I just happened to record this, figured I would share it. Edit: Since the hit em comment seems to have people so fluffed up, allow me to elaborate. I thought the other car coming towards the bison was being disrespectful and not giving the animal the space it deserved. Because the bison was already agitated, I thought it would serve them right to get butted like the previous car did. Petty, perhaps, but I dislike people that think they re more important than what is