The Vu Quang National Park on Wednesday said it received the douc from forest protection services of Ky Anh Town.
A few days prior, Nguyen Hong Dinh, a local from Ky Anh, saw a person catching a douc during a trip to the nearby Quang Binh Province. Aware of its endangered status, Dinh bought the animal, took care of it and eventually handed it to authorities.
"The unit is sending personnel to take care of and monitor the health of the douc. We would release it back into the wild in future," a representative of the national park said.
The red-shanked douc (Pygathrix nemaeus) is listed as critically endangered in accordance with the IUCN Red List. Hunting and habitat loss are major threats to its survival.