Steven Rinella wrote an interesting book* about hunting a buffalo (Bison bison bison) in Alaska, and even using buffalo chips for fire fuel. Says the wild bison have orange fat from eating carotene rich plants rather than grain.

* Steven Rinella, American buffalo: in search of a lost icon (Doubleday/Random House, Spiegel & Grau Ebook v 3.0, 2008).