The First Woman is the primal ancestress of Gimi cosmogony, paired with her brother, the First Man. Their incestuous union is the origin of humankind, and her first menstruation is the mythic prototype of women's monthly bleeding. Sources link her body to the origin of the moon, which in several tellings is her concealed firstborn son. She is closely identified in Gimi thought with the cassowary, the wingless maternal bird of the forest, so that the boundary between the first woman and the primal cassowary-mother is deliberately blurred.