Example of 1D gear used in planthopper used for syncing the movement of the legs [1]. Even there the gears are only used for young planthoppers, and adults use

Example of 1D gear used in planthopper used for syncing the movement of the legs [1]. Even there the gears are only used for young planthoppers, and adults use another syncing mechanism after their skin molts away. [1]: https://www.smithsonianmag.com/science-nature/this-insect-has-the-only-mechanical-gears-ever-found-in-nature-6480908/ https://www.smithsonianmag.com/science-nature/this-insect-ha...