The truth is out there for a group of amateur investigators who search for evidence of the existence of large apelike creatures roaming throughout western Pennsylvania. The creature known as Bigfoot is described as standing nearly 8 to 10 feet tall with footprints measuring 17 or more inches in length. It has been seen by hundreds of witnesses over the past 50 years. Eric Altman, of Jeannette, hasn't had a sighting of the elusive creature, but he's heard unidentifiable sounds and tracked miles of large inhuman footprints in the woods of central and western Pennsylvania. "In the summer of 2000, I was investigating a Bigfoot sighting in Bradford County when I heard growling, mumbling, raspy breathing and heavy footfalls in the woods," said Altman, who, along with his wife, Kathy, are the director and secretary, respectively, of the Pennsylvania Bigfoot Society. "In some sightings, people have reported hearing it sound like a woman screaming." Denny Calisti, and his wife, Colleen, also of Jeannette, serve as the society's assistant director and treasurer, respectively, which the couples formed in 1998. Calisti became intrigued by all things paranormal as an 11-year-old boy growing up in the Export area. He was walking in the woods when he saw something large, standing on two feet that he couldn't identify. The Calistis also head the Pennsylvania Researchers Organization, which involves them in wildlife and scenic photography, paranormal investigations, archaeology, and cryptozoology.