A Guide to Sky MonstersWhen a dark shadow passes overhead, do you stop? Or do you run? Infamous sky monsters have haunted our imaginations for centuries. The Thunderbird, steeped in Native American folklore, supposedly controls evil by throwing lightning. The Jersey Devil is said to roam the Pine Barrens of South Jersey, terrorizing anyone who crosses its path. And the cryptic warnings of Mothman have worried residents of Point Pleasant, West Virginia, since the 1960s. In A