Javan langurs are Old World monkeys, a term describing monkeys from Africa and Asia. There are two subspecies of Javan langur; T.a.mauritius and T.a.auratus, the species held here at Twycross. This subspecies has two distinct colours, the more common glossy black colour and the deep orange colour with yellow tinges around the face and limbs.
The word langur means long tail in Hindi. They live in groups of around seven individuals with one or two mature adult males, several females and their offspring.
They communicate through calls, touch and visual signs to establish rank and warn each other of potential predators. There is no competition between males which ensures that they all reproduce.
Females have a single infant once a year. All of the females in the group will contribute to looking after the infant, a practice known as allomothering. Infants are born bright orange. It is suggested this is so mothers and other females can always track the infant and be sure it is cared for.
Javan langurs eat mainly leaves and flowers. They have enlarged saliva glands and a two compartment stomach to aid digestion of their leafy diet. The first stomach contains bacteria that help break down the leaves before they enter a second.
The major threat facing Javan langurs is habitat loss with large areas cleared for logging and agriculture. It is not uncommon for whole areas of forest to be set alight to clear them for farming. This has devastating consequences on the tree-dwelling langur.