A monster is a creature.
 Human monsters are those who by birth were never fully human (Medusa and her Gorgon sisters) or who through some supernatural or unnatural act lost their humanity (werewolves, Frankenstein's monster), and so who can no longer, or who never could, follow the moral law of human society
 For instance, Grendel in the epic poem Beowulf is an archetypal monster: deformed, brutal, and with enormous strength, he raids a human settlement nightly to slay and feed on his victims

