Is a Turtle Shell Really Modified Ribs?

It’s thought that the evolution of turtles
A turtle shell is not a shell at all but is made up of specially evolved ribs.

Ceri Weber on X: I regularly get asked if a turtle is a vertebrate (yes!), and I think the confusion stems from folks thinking the shell is like a crab's or snail's.

Turtles DON'T live inside their shells as shocking reality horrifies Twitter users who were 'gravely misinformed

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How the Turtle Got Its Shell, With Apologies to Aesop, At the Smithsonian

Zero Hour on X: Turtle shells are actually evolutionary modifications of the rib cage- they can't wiggle out of them, just like you can't wiggle out of your own bones! /

If you've ever wondered about turtle shells…