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

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

Mary McDonald / Hanuman Langur / Northern Plains Grey Langur (Semnopithecus entellus) mother with baby in tree. Kanha National Park, Madhya Pradesh, India.

Mary McDonald / Hanuman Langur / Northern Plains Grey Langur (Semnopithecus entellus) in leafless tree top. Kanha National Park, Madhya Pradesh, India.

Aflo / Northern plains grey langur (Semnopithicus entellus) group resting by trees, Bandhavgarh National Park, India

David Pattyn / Hanuman / Northern Plains Grey Langur (Semnopithecus entellus) family resting in roots of Banyan tree. Ranthabore National Park, India, June.

Andrew Parkinson / Hanuman / Northern Plains Grey Langur (Presbytis entellus) adult female sitting. Bandhavgarh National Park, India.

Andrew Parkinson / Hanuman / Northern Plains Grey Langur (Presbytis entellus). A youngster prepares to leap from the controversial fence that now surrounds large sections of Bandhavgarh National Park, to a tree branch h...

Andrew Parkinson / Hanuman / Northern Plains Grey Langur (Presbytis entellus) adult bounds across open ground. Bandhavgarh National Park, India.