I hear that. I watch all the old 'Finding Bigfoot' shows, even though I know they're kind of hokey and they never "find Bigfoot."
A friend and I were way the hell out at the end of this road back out in the boonies one night around 3:00 in the morning, swillin' down a couple cold ones and blasting away with a shot gun out into the swamp bottoms of the Wisconsin River, and all of a sudden this guttural ROAR/SCREAM/BELLOW came from a direction that no way in HELL could a PERSON be where the sound came from, and it was like nothing either of us had EVER heard before. I grew up in the woods. I know sounds of nature, I've heard about every animal indigenous to this area, and what we heard was NOTHING like ANYTHING I've ever heard before. It was insane. We looked at each and said, what in the hell was THAT? Worst part was, we had to backtrack the dead end road kind of in the direction of the sound. We both had 3/4 ton, 4x4 trucks and figured we could plow over anything that got in the road, but we still beat it otta there with ALL HASTE. There's been other sightings and sounds reported in this area too. We have plenty of wilderness that a creature like that could hide and not be seen if it didn't want to. But to think, I grew up here, I've walked and hunted these woods all my life. Wonder how close I might have been to a Bigfoot and never knew it.
Some people say they're a mythical creature though, and can disappear and appear. That's what most Indians believe.