Swan May
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The Swan May or Swan Maiden is a legend in which a young, unmarried man steals a magic robe made of swan feathers from a swan maiden so that she will not fly away and winds up marrying her. Usually she bears him children. When the children are older they sing a song about where their father has hidden their mother's robe, or one asks why the mother always weeps, and finds the cloak for her, or they otherwise betray the secret. The Swan May immediately gets her robe and disappears to where she came from. Although leaving the children may grieve her, she does not take them with her.
If the husband is able to find her again, it is an arduous quest, and often the impossibility is clear enough that he does not even try.
This is a common motif in folk tales across the world, though the animals vary. The Italian fairy tale "The Dove Girl" features a dove. There are Celtic selkies, taking seal shape. A Croatian tale features a she-wolf. In Africa, the same motif is shown through buffalo maidens. In East Asia, it is also known featuring maidens who transform into various bird species. In Japan, it is an angel whose robe is stolen (the Tennin). In Russian fairy-tales there are also several characters, connected with the Swan-maiden.