Part 5 - http://www.youtube.com/watch?v=EvY4PSLTKZE
BBC documentary about the Yellowstone National Park in America, home to America's last great Bison herds, the grizzly bear and the grey wolf.
Disclaimer - I do not own the rites to this documentary. All are owned by the BBC. If the owners would like me to remove this video from YouTube, could they please contact me and I will do so