Царевна-лягушка
In some tales, the hero or heroine must obey a prohibition; the bride must spend a period of time not seeing the transformed groom in human shape (as in "East of the Sun and West of the Moon"), or the bridegroom must not burn the animals' skins. In "The Brown Bear of Norway", "The Golden Crab", "The Enchanted Snake" and some variants of "The Frog Princess", burning the skin is a catastrophe, putting the transformed bride or bridegroom in danger. In these tales, the prohibition is broken, invariably, resulting in a separation and a search by one spouse for the other.