Wurdulac

thumb|Vampir by Ernst Stöhr, 1899

Vourdalak, also spelled wurdalak, verdilak, vurdulak or vurdalak (), is a kind of vampire originating in Russian literature. Some Western sources define it as a type of "Russian vampire" that must consume the blood of its loved ones and convert its whole family. This notion is based apparently on Alexey K. Tolstoy's novella The Family of the Vourdalak, telling the story of one such Slavic family.