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Primate Conservation

Coordinator:  Nancy Ruggeri, Department of Zoology,
University of Wisconsin-Madison


The World's Top 25 Most Endangered Primates- 2002

A recent report released by Conservation International (CI) and the Primate Specialist
Group of IUCN was finalized at the 2002 International Primatological Society meetings
in Beijing. It is a revision of their previously released "The World's Top 25 most Endangered Primates",
which indicates that about one out of every three primate species is currently
threatened with extinction.  This updated version suggests that Indonesia now exceeds
Madagascar and Brazil for the country with the most endangered primates.  However,
Madagascar, identified as one of the world's biodiversity hotspots, has 10 critically endangered
species, and 21 endangered species.  For the full report, please refer to the link at the bottom
of this message.

Each week, we will be featuring one of the 25 primate species in peril.  This is being
done in conjunction with Conservation International.  The fact sheets are compiled by
Sean Flannery at the WPRC Library and Information Service.

Delacour's Langur
Trachypithecus delacouri

Delacour's langur is one of the most highly endangered of Southeast 
Asia's colobine monkeys. It is distinguished from other largely 
black-colored Asian langurs by its white cheek bands, the large
white saddle on its outer thighs and lower back, and its 
thickly-furred tail. The species is endemic to
Vietnam and was first described in 1932. Like most of Vietnam's 
primates, it is threatened not only
by habitat loss, but also by hunting, which is often done not 
primarily for meat, but for bones,
organs and tissues that are used in the preparation of traditional 
medicines. Based on recent surveys, the presence of nine wild 
populations of Delacour's langur can be confirmed, the largest being 
perhaps 40 to 50 animals, and at least an equal number are believed 
to still exist, most in
unprotected forests. The total population is not believed to exceed 
300 individuals. Protected
populations are found in Cuc Phuong National Park, the Pu Luong 
Provincial Nature Reserve, and
the newly-established Van Long Provincial Nature Reserve, which is 
believed to harbor the largest
remaining population. Efforts to save this species are being led by 
Dr. Tilo Nadler, director of the
Endangered Primate Rescue Center at Cuc Phuong National Park, 
established in the 1990s
primarily to safeguard the future of this langur and other endangered 
Vietnamese primates.

Photo Links:

This information is from a report by Conservation International: Primates in Peril, 
The World's Top 25 Most Endangered Primates- 2002. The full report is available at:

Relevant Citations from Primate Lit (
Brandon-Jones D.  1995.  A revision of the Asian Pied Leaf monkeys 
(Mammalia, Cercopithecidae, Superspecies Semnopithecus-Auratus with a 
description of a new subspecies.
Raffles B Zool 43 (1): 3-43.

Nadler T. 1996. Distribution and status of Trachypithecus delacouri, 
Trachypithecus francoisi, and Trachypithecus poliocephalus in 
Vietnam. Zoologische Garten. 66(1). 1-12.

Nadler T.  1996.  Report on the distribution and status of Delacour's 
langur (Trachypithecus delacouri). Asian Primates. 6(1-2). 1-4.

Roos C.  2003. Vietnam Primate Conservation Status Review 2002. Part 
2: Leaf Monkeys.  In: Nadler, T., Nguyen Xuan Dang, Lorme, N. & 
Momberg, F.  Fauna & Flora International-Indochina Programme and 
Frankfurt Zoological Society. Hanoi, Vietnam.

Tuyet D.  2001.  Characteristics of karst ecosystems of Vietnam and 
their vulnerability to human impact.  ACTA GEOL SIN-ENGL 75 (3): 

The full report is available at:
Full report
Topics in Primate Conservation is supported by a grant RR00167,
Regional Primate Centers Program, National Center for Research
Resources, The National Institutes of Health.

Posted Date: 06-24-03