Flapping drone can fly, dart, and hover like a bird.
https://www.newscientist.com/article/2249612-flapping-drone-can-fly-dart-and-hover-like-a-bird/
(Photo courtesy of UPI)
Flapping drone can fly, dart, and hover like a bird.
https://www.newscientist.com/article/2249612-flapping-drone-can-fly-dart-and-hover-like-a-bird/
(Photo courtesy of UPI)