1Sociology, Anthropology and Social Work, Texas Tech University, 2Mathematics and Statistics, Texas Tech University
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Previous studies have described methods for cranial capacity estimations in humans and chimpanzees from linear measurements. In the present study, cranial capacity of individual dry juvenile orangutan crania were measured using the conventional filling method and additional linear measurements of length, breadth and height were also taken. The linear measurements were then used to generate a linear regression function that allows for predictions of cranial capacity. The linear measurements were then cross-checked with the volumetric data to reveal a possible method for estimation of cranial capacity in juvenile orangutans. The applications of the method outlined in this study are comparable to similar methods used for humans and chimpanzees. No previous work on orangutan cranial estimation has been published, so this report establishes a basis for future work on juvenile orangutan crania.