In the clip, a camera has been set up in an unidentified forest in the US.
The area is reportedly a hotspot where people have claimed to see and hear the beast many times.
After a few seconds of silence, some howls are heard before an angry roar bellows through the trees.
A second roar is heard not long after this, seeming to get nearer to the camera.
Once you've heard this sound you will never forget it for the rest of your life. To read more and view the video, click here.