Mon Prof Augmenté
A Shell Built From Ribs
A turtle’s shell is made of its own bones. Its ribs grew wide and joined together, so the shell is part of its body and can never come off.
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In the picture
- The spine running down the middle of the opened shell
- A rib curving outward and merging into the shell wall
- The shoulder blade sitting outside the human ribs
Examples
- Your own ribs, which are part of your skeleton and move when you breathe
- A crab’s hard shell, which is its skeleton on the outside
Key takeaways
- The shell is made of the turtle’s spine and ribs grown together.
- A turtle can never step out of its shell, because the shell is its skeleton.
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