Vampires in Slavic culture that had two hearts and two souls, as well as two sets of teeth, but one set growing in normally would pinpoint a Strzyga. When they die, only one soul gets passed on, and the other soul causes the deceased Strzyga to come alive and prey upon other living beings. Burying the body in a separate place than the removed head is said to prevent Strzyga from rising back from the dead; but also burying the body face down with a sickle around it’s head is said to work as well.

See also Polish_mythology