A woman named Samantha captured the footage during a recent walking trip through Downriver Park in Spokane, Washington - but admitted she did not notice the ape-like beast at the time.
In the clip, which has been uploaded to YouTube, what appears to be a big, hairy creature can be seen lumbering through the forest in the distance.
It is impossible to tell exactly what the video shows, but Samantha is convinced it is Bigfoot.
She told US news website KXLY: 'Someone asked me in the comments section if I believed in Bigfoot before the video.
'I have never given it much thought, but now I'm not so sure. Seems real enough to me.'
If you watch the video you'll quickly realize that the hoaxer dispensed with the gorilla suit entirely. The image appears to be that of a person dressed in a black hooded jacket and black pants. It looks nothing like an ape or a gorilla or anything that's even furry, and is in fact so bad that I wonder if it's even an intentional hoax. Maybe these hikers just filmed somebody playing a game of paintball or capture-the-flag.