And of course the Native Americans killed plenty of buffalo.
http://en.wikipedia.org/wiki/Buffalo_jump http://en.wikipedia.org/wiki/Head-Smashed-In_Buffalo_Jump http://www.lewis-clark.org/content/content-article.asp?ArticleID=441
(and: http://en.wikipedia.org/wiki/Buffalo_buffalo_buffalo_buffalo )
[ But I think OP was talking about this:
http://www.pbs.org/wnet/nature/buffalo/nation.html
... scroll to bottom ]
/jordan