Regnum: Animalia
Phylum: Chordata
Class: Mammalia
Ordo: Primates
Familiar: Cercopithecidae
Genus: Trachypithecus
Species: Trachypithecus delacouri
The body weight is 8.1 - 9 kg; the length of the head and body is 0.46 - 0.665 m. There is black fur on the top of the head, with fairly wide white stripes on both sides of the cheeks extending upwards along the edge of the ears. The legs have black fur. The buttock area has white fur extending to the base of the tail and thighs; long arms and legs. The tail is longer than the body, with black fur.

Inhabiting the lush expanses of evergreen forests and dense shrubbery, this remarkable primate species finds its home in the heart of nature's green tapestry. Thriving in elevations that span from 500 to 1,000 meters, these creatures carve their existence on the majestic limestone mountains, where the challenges of limited water sources shape the boundaries of their habitat. It's a delicate dance between survival and adaptation in these pristine landscapes.
The magnificence of their existence is most pronounced in the Vân Long Nature Reserve, nestled within the province of Ninh Bình. Here, against the backdrop of limestone formations and verdant canopies, a notable population of these primates has been meticulously documented. A community of a hundred strong, their presence serves as a testament to the delicate equilibrium they maintain within this protected haven.
Most of the remaining populations are small, with fewer than 20 individuals. A notable exception is a population of 30 to 40 individuals still living in the Pu Luong Nature Reserve, Thanh Hoa province, and another population, recently discovered at an undisclosed location.
A group typically consists of one male, several mature females, and their offspring.
The primary diet consists of tree shoots, leaves, and fruit.
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