Buffalo (American Bison)
I knew Buffalo would turn up eventually, but did not expect
them as road hogs in South Dakota's Custer State Park.  An
entire herd appears in my video, treating the road as their
own private trail.  Buffalo are definitely making a comeback.
Custer State Park, South Dakota, USA
Park rangers later warned me that Buffalo were dangerous,
which may be true.  But that was after I had already been
very close to them in both South Dakota and Yellowstone.  
They seemed harmless in my first encounter, very willing
photographic subjects.  (Far more cooperative than
Pronghorn Antelope, who always ran away from me.)
My best South Dakota Buffalo closeup.  In Yellowstone the
Buffalo intrude upon tourist lodge areas, besides creating
roadblocks as people stop their cars for a better view.
If you have a high speed internet connection, watch this
Intrepid Berkeley Explorer free video of National Parks and
Monuments in South Dakota, Wyoming, Utah & Arizona by
clicking on:
Dances With National Parks