 This hypothesis is supported by the persistence of TSD in certain populations of spotted skink ("Niveoscincus ocellatus"), a small lizard in Tasmania, where it is advantageous to have females early in the season.The warmth early in the season ensures female-biased broods that then have more time to grow and reach maturity and possibly reproduce before they experience their first winter, thereby increasing fitness of the individual.In support of the Charnov and Bull hypothesis, Warner and Shine (2008) showed confidently that incubation temperature influences males’ reproductive success differently than females in Jacky Dragon lizards ("Amphibolurus muricatus") by treating the eggs with chemicals that interfere with steroid hormone biosynthesis.