In other words, the unicorn is rarely little more than a one-horned horse. It's also tempting to cast aside the notion presented in Ridley Scott's 1985 film \"Legend,\" that a unicorn's horn is \"a single horn reaching straight to heaven,\" as if it functions as a sort of divine antenna. Perhaps only the males of the species boast horns as a means of sparring with romantic rivals or communicating sexual fitness to potential mates. Greek historian Ctesias, in which the unicorn's horn is red, black and white. The unicorns of medieval European art were a docile-looking bunch, but older texts described a more fearsome creature.