This nice flapping-wing flying machine was designed by [Nicolas Marc](https://grabcad.com/library/flying-machine-3). It is his personal interpretation of da Vinci's ornithopter flying machines. You can check his work on [this website](https://grabcad.com/nicolas.marc-1).
*I have rigged his model in Blender using bones.*
![](http://c.yamahata.fr/sketchfab/flapping_wings_blender.png)