The region they are mostly found in is called the Annamite Range, a mountainous area that passes through Cambodia and Vietnam.

This species is unique with its coloration among the doucs as it has a bluish face with yellow rings around its eyes a blue scrotum and a pink penis.

[4] The biggest challenges that the black-shanked douc faces in terms of conservation are habitat loss and illegal poaching.

[7] They can be found living in different types of forest: broad-leafed evergreen, semievergreen, mixed, dipterocarp lowland.

[8][9] More specifically, those species of the Pygathrix genus are mostly found in the Annamite Range, a mountainous landscape in Eastern Indochina.

Their rest of their body is black, which includes legs and arms, excluding the pubic patch area which is white, their scrotum is blue, and their penis is pink.

[11] Amongst those observations, color variations occurred for the forearms which were partially or completely white and the lower leg which was dark red.

In a study in Keo Seima Wildlife Sanctuary, one-male units averaged 7.5 individuals, and were composed of a single male, several females and offspring.

Black-shanked doucs have a fission-fusion social system, with fusion of one-male units into bands occurring more commonly in the wet season due to higher food availability.

Studies in Cambodia and Vietnam have shown their diet to consist primarily of leaves, from a wide diversity of plant species.

Fruits, flowers, and seeds were reported as the remaining portion of their diet at various proportions, according to food availability.

During the dry season, the consumption of leaves increased, with a smaller amounts of other food consumed like flowers and fruits.

[8] In 2015, its status was updated as Critically Endangered due to a more alarming rapid rate of population decline.

[10] Illegal conversion of protected areas into agricultural land like banana farms is still occurring in Vietnam.

[13] Indeed, it has been modelled that black-shanked douc would be a vulnerable species with an increase of global average temperatures during the 21st century.