The Air Force Is Developing Bird-Like Microdrones with Flapping

Bird Bond: 'Nano Hummingbird' Drone Takes Spying to the Sky

China is using robotic bird drones with cameras to monitor its citizens

Flapping wing micro-aerial-vehicle: Kinematics, membranes, and flapping mechanisms of ornithopter and insect flight - ScienceDirect

Is it a bird? Is it a bug? No it's a biomimetic microdrone with flapping wings

Video: Pentagon's Robo-Hummingbird Flies Like the Real Thing

Is That a Bug or a Robotic Spy?

Flying animals can teach drones a thing or two

Is it a bird? Is it a bug? No it's a biomimetic microdrone with flapping wings

France Unveils Flapping-Wing Military Drone