No tail, just flapping wings, dressed as a real bird but fitted with a camera, costing $4 million. The new leading edge technology in spy drones recently unveiled and developed by a California company AV for the Pentagon. It can maintain a steady hover in gusts of wind, propels forwards, sideways and spins. Weighing only 19 grams and with a wingspan of 16 cm it is the smallest ever spy drone yet announced. It is described as an observation and surveillance platform capable of providing video feed from inside the building, and can fly indoors or perch on a window ledge.