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reach sexual maturity around age 15 but undergo an additional period of development later in life before they exhibit cheek flanges. Flanged males are generally preferred by females so that unflanged males need different mating strategies to compete with flanged males. The onset of this second
125:, but sexual dimorphism could also develop through differential rates of development. In many insects, the larval period of females is longer than that of males, and as a result of this extended growth period, these female insects are larger than their male conspecifics. Male
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343:; Czekala, Nancy M. (1999). "Reproductive hormone profiles in captive male orangutans: Implications for understanding developmental arrest".
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describes a difference in developmental timing between males and females of the same species. Sexual bimaturism can result in
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later than females. This may be related to selection for later maturation in males in a polygynous mating system.
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primates are generally larger than females of the same species due in part to extended growth periods.
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Leigh, Steven R. (1992). "Patterns of variation in the ontogeny of primate body size dimorphism".
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developmental phase varies greatly and may be influenced by the proximity of other flanged males.
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Shea, Brian T. (1985). "The ontogeny of sexual dimorphism in the
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Utami, Sri Suci; Goossens, Benoit; Bruford, Michael W.; de Ruiter, Jan R.;
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Bimaturism can refer to developmental differences within a sex related to
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305:"Male bimaturism and reproductive success in Sumatran orang-utans"
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demonstrate a particularly high degree of sexual bimaturism.
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In humans, sexual bimaturism is evident in that males begin
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