Cat Ba Island, Vietnam

February 2007

Relocation of female Cat Ba langurs

Since 2000, the Cat Ba langur has been listed as one of the world’s Top 25 Most Endangered Primates (Conservation International and IUCN/SSC Primate Specialist Group), due to its small population and restricted range. In the past, poaching constituted the primary threat to the langurs’ survival and resulted in a population decline from an estimated 2500-2800 individuals in the 1960s to a mere 53 individuals by 2000.

In November 2002, Seacology began support for a langur-guarding program, instituted by the Zoological Society for the Conservation of Species and Populations (ZGAP), that puts local residents in charge of guarding particular subpopulations against illegal poaching. The langur population has increased since the onset of this project, comprising 65 individuals at present, but the overall status of this species is extremely critical.

The remaining langur population is severely fragmented into seven isolated sub-populations, four of which are all-female groups. Due to the isolation of langur groups, an exchange of individuals between groups is no longer possible. The only solution is the relocation of some individuals and groups on Cat Ba Island to the strictly protected langur sanctuary that the Cat Ba Langur Conservation Project (CBLCP) established in 2001. An isolated group of three females has been designated as the first target group for relocation. These females are trapped on a small offshore island, and their return to the main island on their own is no longer possible because the mangrove forests between the main and off-shore islands were destroyed. Seacology will help fund the relocation of these isolated females in an attempt to help the Cat Ba langur population continue to grow.

Full or partial funding for this project provided by
Seacology Japan.
Project Updates
March 2015
The Cat Ba langur is still one of the most endangered primates in the world, but the population is slowly increasing and now numbers about 68. Langur hunting has completely stopped. Local "Langur...
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November 2012
The two isolated females were successfully relocated. No animals were injured during the process, and the females have since been observed joining langur groups and mating with males. In addition,...
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June 2011
Regular trips to the catching site of the langurs took place to check the equipment already fixed at the cave entrance and to plan the remaining steps for the relocation. Because the rainy season...
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January 2011
A Seacology expedition visited the project in November 2010. The group visited a floating ranger station, as well as one of the rangers in a remote part of Cat Ba Island. The relocation will...
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June 2010
The master plan and risk assessment have been translated and submitted to the local authorities, after which meetings were held with the Ministry for Agriculture and Rural Development in Hanoi and...
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November 2009
In September, the CBLCP finalized a risk assessment for the translocation plan. The master plan will be finished in this month. The next steps will involve the translation and the delivery of...
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August 2009
The catching net has been attached to the sleeping cave, and the project leaders are waiting for the langurs to access it - unfortunately, they rarely do so during the rainy season. Collars for...
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June 2009
As of April 2009, after fixing a rope and a test net at the cave, one Vietnamese bachelor student spent several weeks at the catching site to monitor the reaction of the langurs to the equipment,...
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May 2008
In 2007 project leaders assessed the habitat use and migration routes to determine suitable sites for catching and relocation. The best possible site for capture was determined to be a sleeping...
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October 2007
Project coordinator Dr. Rosi Stenke and her colleagues are assessing the habitat use and migration routes to determine suitable sites for catching and relocation. They are scheduled to begin...
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