Note 288 — 31 THE MARRIAGE OF SIR GAWAIN
Reading edition
The Gaelic tale of 'The Hoodie' offers a similar choice. The hoodie, a species of crow, having married the youngest of a farmer's three daughters, says to her, "Whether wouldst thou rather that I should be a hoodie by day and a man at night, or be a hoodie at night and a man by day?" The woman maintains her proper sovereignty, and does not leave the decision to him: "'I would rather that thou wert a man by day and a hoodie at night,' says she. After this he was a splendid fellow by day, and a hoodie at night." Campbell, Popular Tales of the West Highlands, I, 63.
The having one shape by day and another by night is a common feature in popular tales: as, to be a bear by day and a man by night, Hrólfr Kraki's Saga, c. 26, Asbjørnsen og Moe, Norske Folkeeventyr, No 41; a lion by day and a man by night, Grimms, K. u. H. m., No 88; a crab by day and a man by night, B. Schmidt, Griechische Märchen, u. s. w., No 10; a snake by day and a man by night, Karadshitch, Volksmärchen der Serben, Nos 9, 10; a pumpkin by day and a man by night, A. & A. Schott, Walachische Mærchen, No 23; a ring by day, a man by night, Müllenhoff, No 27, p. 466, Karadshitch, No 6, Afanasief, VI, 189. Three princes in 'Kung Lindorm,' Nicolovius, Folklifwet, p. 48 ff, are cranes by day and men by night, the king himself being man by day and worm by night. The double shape is sometimes implied though not mentioned.