 In the version of the myth told in "Prometheus Bound" she initially rejected Zeus' advances, until her father threw her out of his house on the advice of oracles.According to some stories, Zeus then turned Io into a heifer (a cow) in order to hide her from his wife; others maintain that Hera herself transformed Io.In the version of the story in which Zeus transformed Io, the deception failed, and Hera begged Zeus to give her the heifer as a present, which, having no reason to refuse, he did.