Drones in the insect world are fast flying male bees with big eyes but no stinger. Hatched from haploid eggs, they make sperm cells instead of honey. They drift about to find a virgin queen and fertilize her with explosive force, which results in their own death. The drones of ant and wasp colonies serve a similar purpose.
Mechanical drones are robots with stingers. They are programmed and guided by humans instead of by instinct. Unmanned aerial vehicles come in various sizes and configurations, although they are usually downsized fighting machines. They have evolved over a century and a half from bomb-laden balloons, pilotless aerial torpedoes, and remotely controlled airplanes.
Armed drones are used today by the U.S. military overtly and the CIA covertly to smite terrorists. They are named Predator and Reaper. They carry Hellfire missiles and are equipped with the optics of a Gorgon Stare. Unarmed Ravens are small enough to maneuver through city streets by night or day to spot and target terrorists lying in ambush.