Its diet includes Pithecellobium clypearia, Ficus nervosa, Garcinia pauncinervis, Sinosideroxylon pedunculatum, F. microcarpa, Miliusa chunni, Securidaca inappendiculata, Bauhinia sp., and Canthium dicoccum. [11] Finally, a current project is underway by the Global Environmental facility to protect the Nonggang National and Dmingshan Natural Reserves and the langurs living within. Of the many factors threatening their survival today, hunting has had one of the largest impacts. [8], François' langur lives in groups of four to 27 langurs, but will usually be found in groups around 12. While there is no reliable population estimate, there are likely no more than 200 individuals left in Vietnam, according to IUCN. Two subspecies are recognized: T. p. poliocephalus in Cát Bà Island, Vietnam, and T. p. leucocephalus in Guangxi, China.The former (the nominate subspecies), often known as the golden-headed or Cat Ba langur, is among the rarest primates in the world, and possibly the … [12], Despite the extreme and continuing decline in the Francois' langur population, the actions being taken towards the conservation of this species and its habitat are still somewhat minimal. Males and females vary in size with males weighing an average of 7.8 kilogram with an average head-body length of 56 centimeter and females average 6.8 kilogram with 55 centimeter head-body length. Males have a head-body length of 55–64 cm (22–25 in), while females are only 47–59 cm (19–23 in) in length. [6], François' langur has large salivary glands to begin the digestion of tough leaf fibers. Steep limestone outcrops are the … François' langurs are herbivores (folivores). Young François' langurs become reproductively mature after 4-5 years of age. In Nonggang, where it is most prevalent, the natives believe that the langur has medicinal values, and have hunted them to make wine out of their bones, which they believe could cure fatigue and rheumatism. François' langurs live primarily in one-male groups, in which one male mates with multiple females. Though these are the preferred plant species, it still consumes other plant species opportunistically. This is the first birth of this species at the Zoo," … In Nonggang Nature Reserve (China), where it is most prevalent, the natives believe that the langur has medicinal values, and have hunted them to make wine out of their bones, which they believe could cure fatigue and rheumatism. [11] In Guangxi province, an estimated 90% decline in numbers has occurred since the 1980s; a 2002–2003 survey found 307 individuals in 14 populations remained. The largest group of langurs reported numbered 500–600 individuals, and was found in the Mayanghe National Nature Reserve. The lower chamber is similar to that of other mammals, in that it contains the acids that finish the breakdown of food components. Among the few rare species on the planet is the François’ langurs, world’s rarest monkeys, with a population … [10], The preferred habitat of François' langur is a karst topography; limestone cliffs and caves of tropical and subtropical zones. PHILADELPHIA (SBG) — A female endangered François' langur recently born at the Philadelphia Zoo is stealing hearts everywhere. In 1983, the estimated population of the Francois' langur was 4,000-5,000. Population size and distribution of François' Langurs in Yezhong Reserve The profiles of reserve changes and langurs’ demographic status are presented in Fig. The total population was estimated to be c. 200 individuals in 27 mixed sex groups. "We're SO EXCITED to introduce the newest member of our Zoo family: a baby François' langur! [3] Limestone is particularly susceptible to fire; therefore, this practice not only destroys its habitats, but also causes major food shortages for the langur because its diet is primarily foliage. "We're SO EXCITED to introduce the newest member of our Zoo family: a baby François' langur! It isn't known why their coats are so conspicuous, but current hypotheses suggest it may elicit attention, protection and caregiving by adults. [13] It exhibits cryptic behavior and becomes very vigilant upon entry to the cave for final resting as a tactic to avoid any predators. The loss of four animals to hunting in mid-2012 severely hindered recovery prospects for this small cliff-dwelling primate. Based on a literature review, interviews with local people and our survey we found François’ langurs in only three isolated sites, across four counties, with a total area of occurrence of c. 57 km 2. The endangered Francois’ Langur is one of PRCF Vietnam’s flagship species. We surveyed the distribution of Francois’ langur … It is evident that reserve area was increased in 2004, and remained almost the same size since then. In the 1970's, hunting records recorded more than 1,400 langurs killed and in the 1980's more than 1,500 langurs were killed. The Francois' Langur is a globally Endangered primate species found in limestone (karst) forests throughout north-eastern Vietnam and southern China. PHILADELPHIA (SBG) — A female endangered François' langur recently born at the Philadelphia Zoo is stealing hearts everywhere. The population of François' langur has been on a steady decline for the past 30 years. [7] One study investigated time distribution across activities in a disturbed environment, showing resting 35.41%, foraging 31.67%, traveling 14.44%, huddling 9.61%, playing 8.54%, and grooming 0.33%. [13] Sleeping sites are not located in the heart of foraging sites, but are within reasonable proximity, as the preferred nesting and foraging sites do not completely line up with one another. Population. [9] Males within the group take no part in the raising of the young, and the young males leave the group before reaching sexual maturity. Native to China, they are now endangered because of poaching and logging. Current population François langurs are widespread but their populations are isolated. 1992, Canh 1996).Unfortunately, both their population size and habitat areas have been rapidly declining during the past four decades, mainly as a … There is believed to be less than 500 individuals remaining in Vietnam and 1400-1650 in China. The species was historically widespread in seven northern provinces of Viet Nam. The population of François' langur has been declining for several decades. 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