Bison. Not buffalo. As we entered the park on Wednesday morning we ran into a long line of stopped cars. We thought, at first, that there must be animals on the way and people were slowing to see and take pictures. After sitting for AN HOUR! we started to move and got to this big guy. He was just strolling along on the side of the road and a ranger in a truck was staying along side him. Just in case all the out of towners didn't know to NOT hit the bison.