Most then take on the mantle of duty and honour and save the day. The unique parentage often includes gods, angels, dead heroes, animals, acts of magic, acts of weather, or otherwise seemingly simple acts like stepping over a stream or a fire. Birds are a favourite disguise of gods when they come to visit mortal women. In a lot of the art depicting the Christian version of Jesus' conception the Virgin Mary was visited by the Holy Ghost as a white dove which impregnated her. Bulls are often parenting children, as in the case of Cretan Queen Pasiphae mating with a white bull to produce the Minotaur, a miserable half-breed who ended up causing no end of grief.
Legend has it a Mongolian princess also mated with a bull.
The resulting baby was locked in an iron cradle and cast into Lake Baikal, then luckily was found by a shaman who raised the child to become founder of the Bulagat clan. Sometimes this child is said to be Genghis Khan. Psychoanalyst Sigmund Freud had a field day with sons and fathers and death-wishes. We don't take it all so seriously now, but back then, these ideas were endemic in his circle. Greek King Acrisius imprisoned his daughter Danae to avoid the prophecy of her future son killing the old man.