My favourite subjects - Werewolf

A werewolf (or lycanthrope) in folklore and mythology is a person who shapeshifts into a wolf, either purposely, by using magic, or after being placed under a curse.

The medieval chronicler Gervase of Tilbury associated the transformation with the appearance of the full moon, but this concept was rarely associated with the werewolf until the idea was picked up by modern fiction writers. Most modern fiction agrees that a werewolf can be killed if shot by a silver bullet, although this was not a feature of folk legends. Werewolves are sometimes held to become vampires after death