Calvin Grinnell is a historian of Mandan and Hidatsa peoples. He produced and published the YouTube video Coyote Races Buffalo. A telephone interview by Twbtg2 was conducted on December 9, 2008. Calvin understand Hidatsa conversationally, as it is the most prevalent non-English language spoken on his reservation. Calvin is also very good friends with Dr. Raymond Wood, a retired professor from the University of Missouri.