A hummingbird-shaped spy drone that could fly undetected into enemy positions has been unveiled in the US. The Nano Hummingbird has a wingspan of 6.5 inches and weighs 19 grammes, less than an AA battery. Developed over five years at a cost of £2.5m, the Nano Hummingbird can fly up to 11 miles per hour and can fly up and down, forwards and backwards, sideways and can rotate.
During a demonstration, it flew in and out of a building through a normal-size doorway, all the time beaming back images from its tiny onboard camera. Pentagon contractor, AeroVironment, claim they have accomplished a technical milestone never before achieved-controlled precision hovering and fast-forward flight of a two-wing, flapping wing aircraft. Army chiefs hope to use the drone's tiny camera to spy on enemy positions in war zones without arousing detection, and eventually deploy it into both rural and urban environments.