Huldra

In Scandinavian folklore, the huldra is a seductive forest creature. Other names include the Swedish "skogsrå" and "skogsfru" (meaning "lady of the forest") and "Tallemaja". Huldra derives from Norwegian and means "covered" or "secret." Seen from the front, she is a naked woman, of impressive beauty and with long hair; From behind, it is hollow like an old log. In Norway it has a cow's tail and in Sweden it can have a cow's or fox's tail. In Norway she has often been described as a typical milkmaid, wearing the clothes of a normal farm girl, although somewhat more dazzling than most girls.