昆虫はSUGEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
http://blogs.smithsonianmag.com/science/2013/09/this-insect-has-the-only-mechanical-gears-ever-found-in-nature/
歯車機能付！！