Types of monkey -

Delacour's Langur Monkey

Trachypithecus delacouri

Delacour's Langur monkey

Delacour's langur, also known as the whiterumped black leaf monkey, and is prevalent in Vietnam, arising in an extremely limited area in the north of the country that consists of about 5,000 km2 between 20-21N and 105-106E. The division is closely linked to the limestone mountain ranges in the provinces Ninh Binh, Thanh Hoa, Hoa Binh, and Ha Nam. At this time there are 18 places where Delacour's langurs appear. They are a secluded population, and make up just 400 to 450 km. Five localities are known where indigenous people have testified that it has been extirpated. The north-western perimeter of the circulation is Mai Chau, amongst the Da River in the north and the Ma River in the south. The Da River appears to outline the northern perimeter of the species' variety, but the precise southern border is vague. There are several remote limestone areas south of the Ma River, however, the only place where they are known there is the limestone complex between Lang Chan and Ngoc Lan. This population is, however, now most probably extirpated. It seems that this species did not ever appear south of the Chu River.

Throughout the decades after the Delacour's langur was located in 1930 there was just scarce evidence on its survival and circulation. In 1987, the original sightings of live creatures were conveyed from Cuc Phuong National Park. Poaching is the highly critical, and for certain subpopulations, the only reason for the drop in numbers, which is not predominantly for meat, but for bones, organs and tissues, which are used to prepare conventional medicines. The 18 remote uninhabited populations of Delacour's langur have been verified over 10 years of investigations and observations by the Frankfurt Zoological Society. In 1999/2000, the entire population totalled approximately 280 to 320 beings. The documented numbers of animals hunted over the 10 years in 1990 to 1999 added up to 320, a yearly loss of over 30 creatures; however, the actual number is definitely greater. Sixty percent of all existing Delacour's langurs appear in remote populations with less than twenty creatures. With no supervision, harsh protocols and law enforcement, the death of these subpopulations, and subsequently 60% of the whole population, is likely.

In 2004, studies in two safeguarded areas with vital subpopulations-Cuc Phuong National Park and Pu Luong Nature Reserve-illustrated a drop in numbers of 20% in 5 years between 2000 to 2004. Studies were conducted in 2008 by the Frankfurt Zoological Society to explore the options to relocate tiny secluded populations under extreme risk. The study results show a constant decline. The population in Ngoc Son Nature Reserve is likely to be extinct, the population in Pu Luong Nature Reserve dropped by approximately 25%, and the population in Cuc Phuong National Park decreased to 8 to 11 creatures. It is to be anticipated that the population in unguarded area, which have still to be examined will illustrate a comparable trend. A sensible estimation of the current population suggests no more than 200 creatures. Studies by the Frankfurt Zoological Society remain, and ought to give background information about the position of populations and logistics for relocation. Increasing security for the majority of the subpopulations is not a sensible choice, and the majority of subpopulations are too small to rescue without committed management.

Four locations where Delacour's langurs appear are safeguarded: Cuc Phuong National Park, Pu Luong Nature Reserve, Hoa Lu Cultural and Historical Site, and Van Long Nature Reserve. Van Long Nature Reserve is thought to harbour the biggest lasting population. Delacour's langurs are guarded well because of the firm collaboration between the provincial forest protection authorities and a local guard unit salaried and guided by the Frankfurt Zoological Society. The population of Delacour's langurs has increased by approximately 35% since the Nature Reserve was formed in 2001, and totals 80 to 90 creatures at present. Attempting to rescue this species is one aim of the Vietnam Primate Conservation Program of the Frankfurt Zoological Society and the Endangered Primate Rescue Centre at Cuc Phuong National Park, founded in 1993 mainly to protect the future of this and other threatened Vietnamese primates. The Endangered Primate Rescue Centre is the only facility that sustains this species. 15 individuals have been born since 1996 after the centre began a breeding program with five confiscated animals. The goal is to bring back these Langurs into very secure areas to create extra uninhibited varying inhabitants.


  • Baker, L. R. 1999. Survey of the Delacour's langur. Report, Frankfurt Zoological Society, Frankfurt.
  • Le Van Dung and T. Nadler. 2008a. The status of Delacour's langur (Trachypithecus delacouri) in the limestone area of Xich Tho, Ninh Binh Province. Report, Frankfurt Zoological Society, Frankfurt.
  • Le Van Dung and T. Nadler. 2008b. The status of Delacour's langur (Trachypithecus delacouri) in some limestone areas of Ha Nam and Hoa Binh Provinces. Report, Frankfurt Zoological Society, Frankfurt.

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