Adult male, Vietnam
Photo by Le Khac Quyet
Tonkin Snub-nosed Monkey
The Tonkin snub-nosed monkey is one of five species of snub-nosed monkeys (Rhinopithecus spp.), which include the gray snub-nosed monkey (R. brelichi), black snub-nosed monkey (R. bieti), golden snub-nosed monkey (R. roxellana), and the new species Burmese snub-nosed monkey (R. strykeri) recently discovered in 2010 . The Tonkin snub-nosed monkey is critically endangered and is a global priority for conservation. Endemic to northern Vietnam, it is estimated that there are only approximately 200 individuals left in the wild . It is also listed as one of the top 25 most endangered primates in the world .
A family group of Tonkin snub-nosed monkeys, Vietnam
Photo by Le Khac Quyet
Research to date
Of the five snub-nosed species, the Tonkin snub-nosed monkey is the only one for which we lack data on genetic variability . It is also the species with the lowest population estimate: R. roxellana with approximately 15,000 individuals has the largest population, followed by R. bieti with a maximum of 2,000 individuals, R. brelichi with 750-800 individuals, and R. strykeri with 260-330 individuals .
Adult male and female
Video by Andie Ang
 Geissmann T., Ngwe Lwin, Saw Soe Aung, Thet Naing Aung, Zin Myo Aung, Tony Htin Hla, Grindley M. & Momberg F., 2011. A new species of snub-nosed monkey, genus Rhinopithecus Milne-Edwards, 1872 (Primates, Colobinae), from northern Kachin state, northeastern Myanmar. American Journal of Primatology 73: 96-107
 Le Khac Quyet, Dong Thanh Hai & Nadler T., 2009. Tonkin snub-nosed monkey (Rhinopithecus avunculus). In: Mittermeier et al. (eds.), Primates in Peril: The World’s 25 Most Endangered Primates 2008-2010, 58
 Mittermeier R.A., Schwitzer C., Rylands A.B., Taylor L.A., Chiozza F., Williamson E.A. & Wallis J. (eds.), 2012. Primates in Peril: The World’s 25 Most Endangered Primates 2012–2014. IUCN/SSC Primate Specialist Group (PSG), International Primatological Society (IPS), Conservation International (CI), and Bristol Conservation and Science Foundation, Bristol, UK., p25
 Yang M., Yang Y., Cui D., Fickenscher G., Zinner D., Roos C. & Brameier M., 2012. Population genetic structure of Guizhou snub-nosed monkeys (Rhinopithecus brelichi) as inferred from mitochondrial control region sequences, and comparison with R. roxellana and R. bieti. American Journal of Physical Anthropology 147, 1-10