Francois' langur

Latin Name
Trachypithecus francoisi francoisi




Francois' langurs have black fur with a white stripe stretching from ear-to-ear and a black crest atop the head. Young langurs display bright orange coloring, an adaptation that scientists believe may encourage females in the group to offer care.



Francois' langurs can be found in the southern Guangxi province of China, northern Vietnam and west-central Laos.


The U.S. Fish and Wildlife Service lists the Francois’ langur as endangered due to habitat loss and hunting. Lincoln Park Zoo participates in the Langur Species Survival Plan®, a shared conservation effort by zoos throughout the Association of Zoos and Aquariums. Helen Brach Primate House Lead Keeper Bonnie Jacobs serves as the Francois’ langur studbook keeper, maintaining breeding records for langurs in zoos across the country.


This primate species occupies dense forests, where they climb through the canopy in search of leaves on which to feed.


Francois langurs feed primarily on leaves. Because leaves are low in nutrients, the monkeys have a multi-chambered stomach that helps them digest their diet. Special bacteria in the stomach also aid the process.

Life History

The species lives in groups consisting of 3–10 individuals. The females show allomothering behaviors, with non-mothers cooperating in their care and feeding of young. Males define their territory with hoarse vocalizations.

Bonus Content

At six months old, Francois' langur Pierre dashes around his exhibit at the Helen Brach Primate House.

Juggling Four Babies
Looking back at a busy year, Curator of Primates Maureen Leahy shares how you care—and prepare—for four zoo babies: gorillas Patty and Nayembi, Francois’ langur Pierre and white-cheeked gibbon Daxin.

A Francois' langur holds her new baby.

Post from the President—A Bright New Baby
In his latest post President and CEO Kevin Bell welcomes a colorful Francois’ langur baby at the Helen Brach Primate House.


Lincoln Park Zoo Exhibit