Harvard's RoboBee X-Wing can fly under its own power
 

RoboBee X-Wing, the latest version of Harvard's robotic bee, has four wings instead of two -- more importantly, it can fly on its own without the need for a power tether. Researchers from Harvard's Microrobotics Laboratory have been working on the Ro...

https://www.engadget.com/2019/06/27/...obobee-x-wing/