I had a side thought last night the girls that I have noticed it on are very heavy constrictors. What I mean by this when I tong feed them their rats they grab and squeeze hard and long. They will hold the rat for ten minutes before they start to swallow.
I wonder if this crease can develope from constriction. I know that snakes don't squeeze with there entire bellies, they use two ridges of muscle one on each side of there belly. So I was thinking over time with enough presure can it cause the crease???? Any thoughts...

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