Francois langur 

IUCN STATUS: Endangered

Trachypithecus francoisi

Found in China and Vietnam these endangered primates primary eat leaves but also fruits and insects. They have two stomach compartments to aid digestion. The first stomach contains bacteria which help break down the leaves before entering the second stomach. Average group size is 12 individuals, but can be from 4 up to 30 individuals. The group is led by the adult females.