A video recently posted to YouTube purports to show a prehistoric reptile soaring over a neighborhood in Boise, Idaho. Critics have suggested it could be a computer-generated hoax or possibly a radio controlled glider. According to Unexplained Mysteries, sightings of winged creatures are not uncommon in the United States. In 1977 three boys in Illinois were allegedly pursued by two gigantic birds, one of which caught and briefly carried away one of the boys before dropping him. Check out the video here.