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We present life history data on wild Sumatran orangutans gleaned from a 32-year and a 5.5-year study. Estimated age at first reproduction was 15.4 years. At 9.3 years, the average interbirth interval for this population is the longest ever recorded for any great ape population, significantly longer than that of a Bornean orangutan population. We find that age-specific mortality of Sumatran orangutans does not differ between sexes and is significantly lower than that of wild chimpanzees. We conclude that orangutan life history is the slowest among extant great apes. In accordance with their slow life history, longevity in the wild is estimated to be at least 58 years for males and at least 53 for females. We find no evidence for menopause. These data suggest that compared to the ancestral state, humans have undergone less of an increase in longevity than commonly assumed, and have experienced selection on earlier cessation of reproduction.
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C Schürmann, and
J A R A M van Hooff, and
C P van Schaik
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American journal of primatology,
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C P van Schaik
October 2002,
American journal of physical anthropology,
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PeerJ,
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American journal of primatology,
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C P van Schaik
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Veterinary world,
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C P van Schaik
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Journal of the experimental analysis of behavior,
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American journal of primatology,
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T Mitra Setia, and
H D Rijksen, and
C Schürmann, and
J A R A M van Hooff, and
C P van Schaik
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American journal of primatology,
