Police in the southern province of Binh Phuoc announced the arrest of a man trafficking in rare primates on Tuesday.
Police told Vietnam News Agency that they had seized eight endangered black-shanked douc langurs - seven dead and one alive - during a raid on the house of 50-year-old Ho Van Huyen after an anonymous tip.
Huyen failed to present documents proving the animals' legal origins, the news agency reported.
He claimed to have bought the animals from two unnamed ethnic minority people for VND2.8 million (US$134).
Police are investigating the case further.
Native to the forests of Vietnam and Cambodia, the black-shanked douc langur (Pygathrix nigripes) is listed as "endangered" by the International Union for Conservation of Nature.
The animal has been categorized as 1B group on Vietnam's Red List, meaning that anyone who hunts or trades in the species faces criminal charges.
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