Delacour's langur, also known as the Delacour's leaf monkey, is a rare primate species found primarily in 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 limestone forests and is known for its social behavior, living in small groups. This species is critically endangered due to habitat loss and hunting. Conservation efforts are underway to protect its remaining populations and habitat. Delacour's langur plays a vital role in its ecosystem, contributing to seed dispersal and maintaining forest health.