Microdrone technology. Researcher using a microscope (output seen on screen at right) to examine the microscopic structure of the wing of the libuelle (dragonfly) microdrone (seen on the microscope sample platform). The 'dragonfly' microdrone weighs only 120 milligrams, is 6 centimetres wide, and has wafer-thin silicon wings that flap when powered by electricity. Microdrones, also known as MAVs (micro air vehicles), are being designed for a wide range of surveillance purposes. The 'dragonfly' microdrone is being developed by the French company SilMach. A prototype was exhibited in 2005.