Over at Hardscrabble Times, Hal Walter mentions his appearance in Haulin' Ass, a documentary about the uniquely Colorado summer sport of pack burro racing.
He himself appears at about the 50-second mark.
A fairly small pool of male and female athletes not only run multi-mile courses at high altitude, but they do it while leading members of the species Equus africanus asinus.
In a nod to the donkey's role in old-time prospecting, each animal carries a pared-down version of a prospector's equipment kit.
The donkey cannot be ridden, it should go without saying.
Sometimes this partner goes along with the plan, and sometimes not. Many times the lead in a race has changed because one runner's four-footed partner suddenly decides against crossing a bridge, for example.