Bison rams grandfather in Yellowstone Park, knocking him metres into the air
The man and his grandson appeared a safe distance away from the bison before it quickly chased them down.
The man and his grandson appeared a safe distance away from the bison before it quickly chased them down.
This article was originally published at: https://www.bbc.co.uk/news/articles/c2dy9krpydlo?at_mediu...