Poe may also have been drawing upon various references to ravens in mythology and folklore. In Norse mythology, Odin possessed two ravens named Huginn and Muninn, representing thought and memory. According to Hebrew folklore, Noah sends a white raven to check conditions while on the ark. It learns that the floodwaters are beginning to dissipate, but it does not immediately return with the news. It is punished by being turned black and being forced to feed on carrion forever. In Ovid's Metamorphoses, a raven also begins as white before Apollo punishes it by turning it black for delivering a message of a lover's unfaithfulness. The raven's role as a messenger in Poe's poem may draw from those stories.