I don't know of any official studies about shed stretching but based on ratsnake observations in the area it appears to be between 10% and 20%, usually closer to 10. I imagine it shrinks over time and is different for larger-bodied snakes. It's very hard to get good data like that in the field because you rarely find sheds in one piece and with many species that don't always have identifiable patterns (adult black rats, ring-necked, etc) how would you ever figure out which snake the shed belonged to? It would be interesting to get a bunch of people to keep track of snake vs. shed lengths X number of days after shed. Having that sort of data could be useful in field studies when only a shed is found.

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