It's a neurological trait in the spider gene. They will kind of sway their head in different angles, they will lay on their backs sometimes, some will cork screw. Honestly it doesn't effect anything, they eat and breed just as well if not better from what is have seen, then any snake. Spiders are a great morph and should be in every collectors rack.
Edit- I just noticed you have a honey bee. So you should know what it is. All spider gene snakes have it to some degree, some are a lot more obvious. Also somethings can really trigger it, such as feeding.
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