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

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

Paul Williams / Red leaf monkey (Presbytis rubicunda) mother holding baby, Danum Valley, Sabah, Borneo, Malaysia August.

Laurent Geslin / Southern plains grey / Hanuman langur {Semnopithecus dussumieri} stretching out hand to touch camera, Ranthambore NP, Rajasthan, India. 2006

Laurent Geslin / Southern plains grey / Hanuman langur {Semnopithecus dussumieri} display, Ranthambore NP, Rajasthan, India.

Loic Poidevin / Thomas's leaf monkey (Presbytis thomasi) Geunung leuser NP, Sumatra

Andrew Parkinson / Hanuman / Northern Plains Grey Langur (Presbytis entellus) two youngsters chase each other up a sloping tree. Bandhavgarh National Park, India.

Andrew Parkinson / Hanuman / Northern Plains Grey Langur (Presbytis entellus) youngster in mid-air leaping from a sloping tree trunk to a nearby tree sapling. Bandhavgarh National Park, India. Non-ex.

Mary McDonald / Northern Plains grey Langur (Semnopithecus entellus) baby holding onto mother, Bandhavgarh National Park, Madhya Pradesh, India

Bernard Castelein / Southern plains grey langur ( Semnopithecus entellus / Presbytis entellus) close up face profile, Sawai Modhopur, Rajasthan, India

Bernard Castelein / Southern plains grey langur (Semnopithecus entellus / Presbytis entellus) tiny juvenile, Jodhpur, Rajasthan India

Mary McDonald / Hanuman Langur / Northern Plains Grey Langur (Semnopithecus entellus) baby playing with a stick by its mother. Kanha National Park, Madhya Pradesh, India.