The Pentagon has been pushing for bat drones for the last few years. The biggest advantage they don't show is that these can be flown at night, making it even harder to tell if they are robots and not animals, and they are highly maneuverable, as well as, efficient fliers. During WWII the Pentagon devised a way to use real bats as drones by strapping incendiary devices to them and releasing them in the large numbers over a large city like Tokyo. The assumption was they would take their explosives and roost under the eves of the nearest buildings. Leonardo Da Vinci was a weapons designer who invented the crossbow, which does not require years to master like an ordinary bow, and this bat robot looks a lot like his designs. Will Smith dates robot, Sophia.