Cliff Barackman, who has been on the trail of the mythical beast for 20 years, recovered giant footprints from an abandoned mattress in the US wilderness.
Photos show the barefooted prints, measuring an enormous 13 inches long by five-and-a-half inches wide, impressed upon the fabric in mud.
And the distance between one footprint and another, heel to heel, was a monstrous 48 inches - suggesting a truly giant gait.
Mr Barackman, 47, said the prints were found in Alderwood State Wayside Park, Oregon - a place where Bigfoot sightings are common.