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In zoos, spectacled langurs typically live to about 15 years of age but can live into their late 20s. Typical lifespan in the wild is not known but is likely to be shorter than in zoos.
The gestation period of a spectacled langur is typically around 150 days. Females usually give birth to a single offspring and occasionally have twins. The inter-birth interval is approximately two years.
Breeding is not always seasonal, but births typically take place between the months of January and March. Spectacled langurs exhibit "aunting" behavior, with mothers transferring their babies among other adult females in the group.
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