The Huldra is a seductive forest creature found in Scandinavian folklore. (Her name derives from a root meaning "covered" or "secret".) The huldra is a stunningly beautiful, sometimes naked woman with long hair; though from behind she is hollow like an old tree trunk, and has an animal's tail. In Norway, she has a cow's tail, and in Sweden she may have that of a cow or a fox. Further in the north of Sweden, the tail can be entirely omitted in favor of her hollow or bark-covered back.
Bojnice castle, Slovakia.