You may not be aware of this but all magnets including the rare earth/neodymium magnets emit lines of flux emanating through the north pole and back to the south pole of the magnet. A German named Heinrich Lenz is the author of Lenz’s Law of magnetic induction. It states that that an electrical current is induced when a conductor is passed through magnetic flux. Since the cells of our bodies, and snakes bodies, contain mostly saline water which is a conductor, it is entirely conceivable that a snake moving past one of these super magnets could be electrocuted.