A robot that looks like a bird, flaps its wings like a bird and flies like a bird could be used as a stealthy, camouflaged drone
Source:
https://www.newscientist.com/article/2269774-eagle-inspired-robot-flies-by-flapping-its-feather-covered-wings/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home