Douc Langurs are native to which continental habitat?

The doucs or douc langurs make up the genus 'Pygathrix'. They are colobine (leaf-eating monkeys) Old World monkeys, native to Southeast Asia, which consists of these 3 species: 'red-shanked douc', 'black-shanked douc', and 'gray-shanked douc'. Even though they are known as "douc langurs", they are in fact more closely related to the 'proboscis monkeys' and 'snub-nosed monkeys' than to any of the langurs.

Douc langurs are found in the tropical forests of central and southern Vietnam, southern Laos, and northeastern Cambodia. They live in small family groups headed by one adult male. A single group may have several adult females and many children. Young males unaffiliated with a family group often make their own troops. Females usually bear a single offspring at a time, which is suckled for about a year.