Very high possibility. If in medieval times we had very high-class technology. We can say that the unicorn was made as a powerful horse for an intelligent race. By the way, how less scientific is a horse with only a horn on its head? read more
Indeed mediaeval chroniclers like their Classical predecessors, believed that before humans evolved there was a race of composite animals (that is beasts made up of different animal and bird characteristics.) These were destroyed by the deities once they perfected making true animal forms but a few escaped and lived for hundreds of years in remote places until they finally died out-or were killed by would-be heroes in search of glory. read more