The Delacour's leaf monkey, also known as Trachypithecus delacouri, is a primate species native to the forests of Vietnam. This monkey is characterized by its striking black and white fur, with a distinctive white face and long tail. It primarily inhabits the canopy of tropical and subtropical forests, where it feeds on leaves, fruits, and flowers. Delacour's leaf monkey is considered endangered due to habitat loss and hunting. Conservation efforts are underway to protect its remaining populations and habitat. This species plays a vital role in its ecosystem by aiding in seed dispersal and maintaining forest health.