[4] In 2016, Dr. Benjamin Rawson, Country Director of Fauna & Flora International's Vietnam Programme, announced a discovery of an additional population including more than 500 individuals found in Central Vietnam, bringing the total population up to approximately 1000 individuals.

[5] P. cinerea was originally described as a subspecies of P. nemaeus in 1997,[6] but later elevated to species status due to morphological differences.

[10] Grey-shanked doucs also engage in grooming to remove parasites and to establish and strengthen bonds between group members.

[10] Grey-shanked langurs are primarily folivourous but will also eat other plant parts such as seeds, fruits, and flowers.

The mother will give birth to one offspring weighing 500 g to 720 g. Females are sexually mature at about four years of age.

In 2016 in the Central Highlands, Gray-shanked douc Langurs were tortured and murdered by Vietnamese troops who posted pictures of it online.

[14][15] Researchers have concluded that due to the major deforestation and climate change of these provinces of Vietnam, that the population of the Grey-shanked duoc will sharply decline in the next coming years (Vu et al., 2020).

Their species will be pushed into a high mountainous area with little to no resources for survival (Tran et al., 2018) Studies are under way to learn more about the distribution, range, and behavior of grey-shanked doucs.

A long-term study in the Gia Lai Provence is currently being conducted as a part of the Frankfurt Zoological Society's Vietnam Primate Conservation Program.

[4] The Frankfurt Zoological Society also works with the Endangered Primate Rescue Center which has an ongoing Captive Breeding program.

[2] On July 3, 2007, it was reported that the WWF and Conservation International had monitored at least 116 of the primates in central Vietnam, increasing its chances of survival.

[16] On March 3, 2016, Fauna & Flora International announced that a new population of over 500 grey-shanked doucs had been discovered in Central Vietnam.