 Some fishes such as the foureye butterflyfish have eyespots near their tails, and when mildly alarmed swim slowly backwards, presenting the tail as a head; however, various hypotheses for the function of such eyespots have been proposed.Several species of pygmy owl bear false eyes (ocelli) on the back of the head, misleading predators into reacting as though they were the subject of an aggressive stare.Automimicry has sometimes been used in military vehicles and aircraft.