There's a horrible movie from 1978 you've probably never heard of called "Buffalo Rider" . . . and the main character is a half-cowboy, half-hippie who rides around on a buffalo looking for adventure.
-I'm only mentioning this because someone found the footage on YouTube, and wrote a ridiculous song about it called "Guy on a Buffalo".
There are two videos, with two different versions of the song: In the first one, the guy rides around on the buffalo, chases a bear, and beats up an Indian.
But the second one is even better: He finds a baby in a field, tries to ride the buffalo across a river, then goes hunting and randomly gets attacked by a mountain lion.