The Flying Serpent (1946)

The demented archaeologist Dr. Andrew Forbes discovers a living, breathing serpent-creature known to the Aztecs as Quetzalcoatl, the Killer Bird God. Tragically, he causes his wife's death by giving her one of the beast's feathers, causing the creature to track her down and slaughter her. Now, Dr. Forbes uses this twisted knowledge to exact revenge upon his enemies by placing one of the serpent's feathers on each of his intended victims and letting the beast loose to wreak havoc.