A train passenger recently captured video footage of a hairy humanoid figure walking across a nearby hillside.
Shannon Parker and her husband had been riding on a train through the San Juan Mountains between Silverton and Durango at the weekend when they spotted the alleged creature.
"When I saw it, we were looking for elk," her husband Stetson told Cowboy State Daily.
"It wasn't moving like a bear or anything else I've ever seen."
Another passenger, who had been seated near the couple in the rearmost carriage of the train, took out his mobile phone and captured a short video clip.
The resulting footage (viewable below) quickly went viral online.
It shows what appears to be a distinct figure covered entirely in light-brown hair. In the clip, it can be seen walking towards the left while camouflaged by the grass on the hillside.
After a few seconds, it squats down and waits as the train rolls slowly past.
But is this really evidence of Bigfoot or could the whole thing have been an elaborate prank ?