Millimetre-Sized Drone (image) Institute of Physics Caption Biologically-inspired flapping-wing robots are shown. Credit Pakpong Chirarattananon et al. 2014 Bioinspir. Biomim. 9 025004 Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.