In Eastern Slavic folklore (Russia, Ukraine, Belarus), the Upyr (less commonly spelled Upyri) were vampires that had iron teeth and roamed, surprisingly, during the day. They would be active from noon to midnight and first went after children, then their parents. Otherwise, Upyr were said to look fairly human. Upyr believed to originate with evil spirits possessing the bodies of the unclean dead. There seem to have been variants of this same concept around Eastern Europe. In Poland, it was spelled Upier (or Upior), to the Czech and Ukrainians, it was spelled Upir (or Opir), in Belorus, Upor (in Russia, it was spelled Upyr, Upyry, Upyri). The Polish variant has barbed tongue which can drink "vast" amounts of blood and it sleeps in a pool of blood. When staked, this version explodes. A perso