Planes flying by flapping their wings.
The purpose of this project is to achieve humanity's oldest aeronautical dream: flight with mechanical flapping wings. Many early aircraft concepts assumed that such imitation of birds and bats was the proper design direction. However, the challenge of achieving both efficient lift and thrust with flapping wings was far greater than simply using the wings for lift and providing thrust with a separate propulsor.
Interesting notion. The people behind this have gotten a model ornithopter to fly, but their efforts to get a full size plane flying looks a little sketchy. If you watch the videos on the site, it looks like the wings are just going to snap off if it ever became airborne.