Von den zwölf Brüdern, die als Raben verwandelt wurden or The Twelve Brothers, Twelve Black Ravens, the witch stepmother asks for her husband to kill his sons, burn their bodies and deliver her the ashes. In the Hungarian variant A tizenkét koronás hattyu és a csiháninget fonó testvérkéjük, the boys' poor mother curses her twelve sons into the avian form, while also giving an escape clause: after their sister is born, she should sew twelve shirts to save them. In a Sudanese tale, The ten white doves, the titular white doves are ten brothers transformed by their stepmother. Their sister has a dream where an old woman tells her the key to reversing the curse: weaving coats with leaves from the acacia tree she is placed on by her brothers after fleeing home. Results of transformation The other variation is in the result of the brothers' transformation: in some versions they are ducks, in others ravens, and even eagles, geese, peacocks, blackbirds, storks, cranes, jackdaws or rooks. The eagle transformation is attested in the Polish tale Von der zwölf Prinzen, die in Adler verwandelt wurden (English: "The Twelve Princes who became Eagles"), translated as The Eagles. A similar transformation is attested in a Romanian tale, which was also compared to the Grimm's tale. The geese transformation is present in the Irish variant The Twelve Wild Geese, collected by Irish folklorist Patrick Kennedy and compared to the German variants ("The Twelve Brothers" and "The Seven Ravens") and the Norse one ("The Twelve Wild Ducks"). In a tale attributed to Northern European origin, The Twelve White Peacocks, the twelve princelings are transformed into peacocks due to a curse cast by a troll. The blackbird transformation is attested in a Central European tale (The Blackbird), collected by Theodor Vernaleken: the twelve brothers kill a blackbird and bury it in the garden, and from its grave springs an apple-tree bearing the fruit the causes the transformation. The avian transformation of storks is present in a Polish tale collected in Kraków by Oskar Kolberg, O siedmiu braciach bocianach ("The Seven Stork Brothers"). The Hungarian tale A hét daru ("The Seven Cranes") attests the transformation of the brothers into cranes. The jackdaw transformation is attested in the Hungarian tale, A csóka lányok ("The Jackdaw Girls"), wherein a poor mother wishes her rambunctious twelve daughters would turn into jackdaws and fly away, which was promptly fulfilled; and