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

2 monkeys hi-res stock photography and images - Alamy

Monkeys on tree hi-res stock photography and images - Alamy

Engraving depicting a Purple-Faced Langur, also known as the purple-faced leaf monkey, is a species of Old World monkey that is endemic to Sri Lanka. Dated 19th century - Album alb4268656

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IPPL Newsletters - International Primate Protection League

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The Haplorrhini – Old World Monkeys – Biological Anthropology: A Brief Introduction

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

Types of Monkeys 334 Old-World Monkeys & New-World Monkeys

Biology 2e, Biological Diversity, Vertebrates, The Evolution of Primates

Monkeys on tree hi-res stock photography and images - Alamy