Werewolf

A werewolf is a human who on the night of the full moon, changes into a wolf-like creature. The wolf-form to some extent keeps the mind of the human-form, but it cannot resist attacking humans. The werewolfism spreads through bite, a human bit by a werewolf in wolf-form will become a werewolf. However, if a human is bitten by a werewolf in human-form, they will only adopt werewolf tendencies.