In folklore, a werewolf, or occasionally lycanthrope is an individual who can shape-shift into a wolf, either purposely or after being placed under a curse or affliction, with the transformations occurring on the night of a full moon. Early sources for belief in this ability or affliction, called lycanthropy, are Petronius (27–66) and Gervase of Tilbury (1150–1228).
Dolon wearing a wolf-skin. Attic red-figure vase, c. 460 BC.
Zeus turning Lycaon into a wolf, engraving by Hendrik Goltzius.
Vendel period depiction of a warrior wearing a wolf-skin (Tierkrieger).
A German woodcut from 1722
In mythology, folklore and speculative fiction, shapeshifting is the ability to physically transform oneself through unnatural means. The idea of shapeshifting is in the oldest forms of totemism and shamanism, as well as the oldest existent literature and epic poems such as the Epic of Gilgamesh and the Iliad. The concept remains a common literary device in modern fantasy, children's literature and popular culture.
Tsarevna Frog (or The Frog Princess), by Viktor Vasnetsov, tells of a frog that metamorphoses into a princess.
Louhi, Mistress of the North, attacking Väinämöinen in the form of a giant eagle with her troops on her back when she was trying to steal Sampo; in the Finnish epic poetry Kalevala by Elias Lönnrot. (The Defense of the Sampo, Akseli Gallen-Kallela, 1896)
"The giant Galligantua and the wicked old magician transform the duke's daughter into a white hind." by Arthur Rackham
Loge feigns fear as Alberich turns into a giant snake. Wotan stands in the background; illustration by Arthur Rackham to Richard Wagner's Das Rheingold