Rod Williams / Francois' Langur (Trachypithecus francoisi) captive from Southern China and NE Vietnam. Endangered species.

Sebastian Kennerknecht / Silvered Leaf Monkey (Trachypithecus cristatus) mother and young, Sabah, Borneo, Malaysia

XI ZHINONG / Phayre's leaf monkey (Trachypithecus phayrei), wild animal in tree, Endangered species, Gaoligong Mountains of Yunnan Province, China.

Sandesh Kadur / Golden Langur (Trachypithecus / Presbytis geei) perching in a tree seen through dense foliage. Endangered. Assam, India, September.

Rod Williams / Francois' Langur (Trachypithecus francoisi) captive, from Vietnam, Laos and Southern China, Endangered

Thomas Marent / Dusky Leaf Monkey (Trachypithecus obscurus) young, Khao Sam Roi Yot National Park, Thailand

Ian Lockwood / Purple-Faced Langur (Trachypithecus vetulus) in a suburban evergreen forest environment. Endemic, Sri Lanka, Endangered species

Nick Garbutt / Female Silvered langur (Trachypithecus cristatus / Presbytis cristata) carrying young infant. Bako NP, Sarawak, Borneo, Malaysia

Anup Shah / Ebony langur climbing. Endangered - native to Java, Indonesia

Anup Shah / Ebony langur climbing {Trachypithecus auratus} Endangered species native to Java, Indonesia

Bernard Walton / Silvered langur (Silver leaf) monkey {Presbytis cristata}, Malaysia

Matthew Maran / Delacour's langur (Trachypithecus delacouri) feeding on leaves, Ninh Binh, Vietnam, 2018.