""The Seven Ravens" is a German fairy tale collected by the Brothers Grimm.
It is tale number 25, and Aarne–Thompson type 451, the brothers who were turned ...
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into birds. Georgios A Megas collected another, Greek variant in Folktales of Greece. Other variants of the Aarne–Thompson type include The Six Swans, The Twelve Wild Ducks, Udea and her Seven Brothers, The Wild Swans, The Twelve Brothers, and The Magic Swan Geese.
An animated feature film based on the story was released in 1937 (see The Seven Ravens)." - (en.wikipedia.org 11.12.2019)
