The U.S Air Force is planning to build a new breed of more-selective military drones (less collateral damage), with swarms of bird-size bots shadowing targets, new unmanned aerial vehicles (UAVs) capable of launching mini-missiles at multiple targets at once, microscopic drones with smaller weapons that can hunt in swarms, and tiny, biologically inspired micro air vehicles (MAVs) that can flap through alleys and inside buildings.