Will Burrard-Lucas / Tufted gray langur (Semnopithecus priam) Close up portrait of head and shoulders. Minneriya National Park, Sri Lanka. September

Suzi Eszterhas / Red-shanked douc langur (Pygathrix nemaeus) infant sucking thumb while caretaker holds it. Animal was rescued from illegal wildlife trade, Endangered Primate Rescue Center, Cuc Phuong National Park, V...

Matthew Maran / Red shanked douc langur (Pygathrix nemaeus) Son Tra Nature Reserve, Vietnam

Matthew Maran / Delacour's langurs (Trachypithecus delacouri) resting, Van Long Nature Reserve,Ninh Binh, Vietnam. Critically endangered

Robin Chittenden / Tufted grey langur (Semnopithecus priam priam) baby, Sri Lanka.

Patricio Robles Gil / Kashir grey langur (Semnopithecus ajax) Dachigam National Park, Jammu & Kashmir, India.

Fiona Rogers / Hanuman Langur (Semnopithecus entellus) group on temple, Virupaksha Temple, Hampi, Karnataka, India

Ingo Arndt / Hanuman langur mother young {Presbytis entellus} Jodhpur India

Sandesh Kadur / Female Dussumier's malabar langur (Semnopithecus dussumieri) feeding with baby, picks it up and walks away, Ranthambore National Park, Rajasthan, India. 2016.

Ingo Arndt / Southern plains grey / Hanuman langur {Semnopithecus dussumieri} mother and baby, Jodhpur, Rajasthan, India

Ingo Arndt / Southern plains grey / Hanuman langur {Semnopithecus dussumieri} females and young, Jodhpur, India

Anup Shah / Southern plains grey langur / Hanuman langurs (Semnopithecus dussumieri) walking along a ledge . Jodhpur, Rajasthan, India. March.