Abstract
Longitudinal reproductive and mortality data collected from two colonies of Hanuman langur monkeys (Presbytis entellus) in California (University of California, Berkeley; San Diego Zoo) are presented. Approximately 10 years of data from each facility reveal that langur monkey females reach reproductive maturity between 3 and 5 years and have median birth intervals, following the birth of a live infant that survives beyond 9 months, of approximately 15.5 months. Births are not seasonal at either facility and pregnancy failure rates at UCB are approximately 30%. Mortality of subadults was highest during the neonatal period (<30 days), and probability of Sarvivorship at 5 years is between .41 and .50. Observed differences and similarities in patterns of reproduction and mortality between the two colonies and field populations are discussed.
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