When a turtle retracts its head into its shell, does the spine buckle or contract?

When a turtle retracts its head into its shell, does the spine buckle or contract?
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1 Answer

Answer :

This is a cool question. I think if you look at cross section of a turtle’s skeletal structure, it becomes easier to understand what happens inside the shell when the turtle retracts its head. It would appear to be less of a retraction, and more of a reversed nodding motion.
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