I personally believe Bigfoot exists & always have for the following reasons:
1)There have been many reports of sightings by seemingly sane, honest people who have nothing to gain & risk ridicule for claiming a sighting of such a creature.
2)A recent two-pronged investigation of the Patterson/Gimlin concluded that a human could not replicate the walk of the subject of the film. In addition, a microscopic frame-by-frame analysis of the film revealed no trace whatsoever of a costume. But did show eye & mouth movement with corresponding muscle movement in the proper areas.
3)There have been tracks found by people very familiar with bears, that have been in found in areas where no hoaxer could have any hope of them ever being discovered. Some trails of tracks stretching for several miles.
4)There have been hair samples missing a medulla that have been deemed "Unknown primate"
5)There have been scat samples found that have failed to be linked to any known animals.
6)There have been vocalization recordings that so far, have defied Identification.
7)Many of these hair, scat, & vocalization samples have come from areas where Bigfoot sightings have been reported.