Watch MonsterQuest Season 1 Episode 4 Online

Native Americans have long revered huge birds called Thunderbirds. There was a rash of giant bird sightings in Illinois, Texas and Alaska back in the 1970's. A giant bird with a 15-foot wingspan allegedly attacked a small child in Illinois. Could there really be a giant bird or is it mass hysteria? Take a scientific journey and follow the many eyewitnesses' accounts across the country and examine the most compelling evidence.