The forest management board in the northern province of Ninh Binh last Thursday released two Delacour's langurs (Trachypithecus delacouri) in the Van Long wetland sanctuary in the province's Gia Vien District.
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The move was part of a project aimed at raising the species' population and diversifying the gene pool for Viet Nam and the world.
The two langurs have been implanted with microchips that will enable experts to monitor their progress.
Delacour's langurs are one of five critically endangered primates in Viet Nam, and are listed in the World's 25 Most Endangered Primates by the International Union for Conservation of Nature.