American Museum of Natural History on X: Ever seen the dusky leaf monkey? This social primate lives in groups of up to 20. It's also known as the spectacled langur due to

Primate Sociality and Social Systems

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The natural history of the primates : Napier, John Russell : Free Download, Borrow, and Streaming : Internet Archive

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2 monkeys hi-res stock photography and images - Alamy

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Dusky Leaf Monkeys Stock Photo by ©gnomeandi 149040387