After watching this quadrotor drone making the craziest maneuvers I can imagine, I only have three thoughts. One, robotic extermination is inevitable. Two, I want one for next Christmas. Three, send a weaponized squadron to fight the mole men here.
https://gizmodo.com/the-gates-of-hell-just-opened-in-guatemala-5551916
The quadrotor Unmanned Aerial Vehicle was made by Daniel Mellinger, Dr. Nathan Michael, and Dr. Vijay Kumar at the GRASP Lab, University of Pennsylvania. [DIYDrones]