Figure 1From: Variation in developmental arrest among male orangutans: a comparison between a Sumatran and a Bornean populationPlastic alternative reproductive tactics. (a) An individual reversibly develops into morph A or B (e.g. mandrills); (b) or an individual develops into morph A and then can irreversibly continue toward morph B, or remain in state A, as in orangutans.Back to article page