At the time of my retirement there were two topics that I considered unfinished business. The first is the Evolution of Sex Differences and the second, the she-male controversy in the Canadian red-sided snake (Thamnophis sirtalis parietalis). These questions are developed in this perspective.
Keywords: evolution; red-sided garter snake; she-male; steroid hormone receptors.
© 2021 Wiley Periodicals LLC.