^
In: 5
A mix of the design of the joint itself and the materials which form it. Energy gets stored and released very efficiently. And what makes this all possible is the scale: at these sizes you can take advantages of the small amount of flexibility thin layers of minerals can have while still maintaning integrity.
One would think the Wikipedia article on mantis shrimp would have that sort of information, but it doesn’t.
Apparently it uses chitin in a spring mechanism, according to this: [https://www.reed.edu/biology/courses/BIO342/2012_syllabus/2012_WEBSITES/HW%20mantis%20shrimp/Mechanism.html](https://www.reed.edu/biology/courses/BIO342/2012_syllabus/2012_WEBSITES/HW%20mantis%20shrimp/Mechanism.html)