AeroVironment Nano Hummingbird

The AeroVironment Nano Hummingbird, also called the Nano Air Vehicle, is a tiny remote-controlled aircraft that imitates a hummingbird, built by AeroVironment to specifications set by the Defense Advanced Research Projects Agency. It flaps its wings for both propulsion and control, and it can hover, fly sideways, backwards and forwards, and enter a doorway to look around indoors. With a wingspan of 160 millimetres and a flying weight of about 19 grams including battery and a video camera, it could fly for up to eleven minutes. DARPA had put about four million dollars into the work since 2006, and the prototype was shown to the public in February 2011.