Pumpkin oil is one of the substances with the strongest dichromatism. They usually display strong sexual dichromatism. In contrast, true lemurs are easier to distinguish and exhibit sexual dichromatism. The marked dichromatism between males and females is still an evolutionary mystery. Sexual dimorphism and dichromatism is well developed. Mulder subsequently spent time in Madagascar studying male plumage dichromatism in the Madagascar paradise flycatcher. In this species sexual dichromatism is extreme. There are two types of dichromatism for frog species&colon; ontogenetic and dynamic. Sexual dichromatism is distinct in the Hainan gibbon. The ghost moth displays high levels of sexual dichromatism (see picture below). Sexual dimorphism within insects is also displayed by dichromatism. Often, sexual dimorphism in coloration (sexual dichromatism) is seen, such as in the black lemur. Sexual dichromatism is often prominent in adult oakblues. Some species exhibit sexual dichromatism, where the coloration of soft parts varies by gender. The genus has some sexual dichromatism, with males having brighter hues.