Once, with a blow of his [Tiresias] stick, he had disturbed two large snakes mating in the green forest, and, marvellous to tell, he was changed from a man to a woman, and lived as such for seven years. In the eighth year he saw the same snakes again and said ‘Since there is such power in plaguing you that it changes the giver of a blow to the opposite sex, I will strike you again, now.’ [S]he struck the snakes and regained his former shape, and returned to the sex he was born with.