I'm not really trying to drag out an ethics thing here but just as a fact, snakes are ectotherms and derive heat from external sources and lack the ability to efficiently conserve their body temperatures so I would assume that death by hypothermia would actually be a very quick process for them. I'm going to go do some research on the topic but just using my intuition alone, it seems like a logical conclusion to draw.
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Guess I should have checked the thread before replying.