Indochinese Gray Lagur - Voọc xám đông dương

About Indochinese Gray Langur: Indochinese Gray Lagur Trachypithecus crepusculus is found from Central and Northwest Thailand to Yunnam in China, East to southwestern Laos and Northern Vietnam (Groves 2001). This taxon was formerly classified as a subspecies of the Phayrei's langur Trachypithecus phayrei crepusculus.However recent genetic data suggest that the taxon is an independant species. IUCN Red List of Threatened Species recognizes the taxon under Trachypithecus phayrei as Endangered criteria (EN). In Vietnam, there are very few reliable records on this taxon, recent sightings are from Mu Canh Chai Species and Habitat Conservation Area (Yen Bai Province), Muong La District (Son La Province) and Xuan Lien Nature Reserve (Thanh Hoa) Province (Figure 1).


Figure 1. Adult Indochinese Gray Lagur and baby from Xuan Lien NR
(Photo: Le Van Dzung & Nguyen Mau Toan)

Conservation Programme

Centre for Resources, Environment and Climate Change (CeREC) is supporting Xuan Lien Nature Reserve to conserve the population of Indochinese Gray Langur in the Reserve through conducting study of the species ecological requirement, conservation awareness education and capacity building for forest rangers of the Nature Reserve.

Figure 2. Forest rangers in training course on Primate monitoing technique

Our recent investigation have recorded 7 groups/troops of Indochinese grey langur (5 groups were sighted and 2 groups recorded by from interview). Each group consists of 30-35 individuals as maximum and total of 100-200 individuals of Indochinese grey langurs was estimated to exist in the reserve. For all recorded groups, each group consists of at least one adult male, several adult females and sub-adults, and four groups have juveniles. The population of Indochinese grey langur in Xuan Lien NR is among the largest populations of this species in Vietnam. However, the population is facing with many threats such as wildlife hunting/trapping; forest habitat degradation; illegal timber poaching; habitat disturbance by illegal encroachment of local residents and free-ranging cattle raising.

Publication & Reports

Nguyen Dinh Hai ,Nguyen Xuan Dang, Dang Huy Phuong et al. (2016). The status of Indochinese Gray Langur Trachypithcus crepusculus at Xuan Lien Nature Reserve, Thanh Hoa province. Vietnamese Journal of Biology. 38(2): 162-170 DOI: 10.15625/0866-7160/v38n2.7890. Download Pdf.

Partners & Donors

CeREC thanks the following donors for their generous sponsorship to our Indochinese Gray Langur Conservation Programme

 Thanh Hoa Provincial People Committee through Thanh Hoa Provicial Dept. of Planining and Investment 

Account information for the donors:
Even a small amount can help!

Name of the Account: Centre for Resources, Environment and Climate Change
Account Number: 1500201086156
Vietnam Bank for Agriculture and Rural Development (AgriBank) - Hanoi Branch
Address of the Bank: 77 Lac Trung Street, Hai Ba Trung District, Ha Noi City
Swift Code: VBAAVNVX 401

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