Sexual Dimorphism in the Cranium of Infant and Juvenile Orangutans

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Abstract
The present study examines sexual dimorphism in the cranium of the immature orangutan. A series of 37 craniometric dimensions were measured on 56 immature crania. The total sample was divided into two subsamples: infants and juveniles. Univariate statistics and an analysis of variance were prepared for each subsample. Results indicate that the males and females in both subsamples are significantly different (p ≤ 0.05) for two measures of skull length. Eight additional dimensions from the infant category also appear to differ significantly (p ≤ 0.05) between the sexes.