A Biological Screw in a Beetle’s Leg

The figures above are from Wikipedia.

Nowadays, the Beetle is a kind very popular mini car. There are lot of nuts and screws. Have you ever thought that a real beetle has similar things: screw? Here are results of some scientist.

（This figure is from Science)

Joints on the legs of weevils form a functional screw-and-nut system. Authors: Thomas van de Kamp, Patrik Vagovič, Tilo Baumbach, Alexander Riedel

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