Robo Raven is created with the support of the United States Military Research Laboratory. Its frame consists of hollow plastic tubes printed on an 3D printer. The wings and tail of Mylar foil are stretched over it. The prototype "robovoron" work with 2007 year - they are constantly falling, breaking, they were attacked by predators.
The latter is caused by the fact that the robot flaps its wings so naturally. Thanks to the independent drive of each wing, it can do hitherto unseen air stunts.