The Cat Ba langur, also known as the Golden-headed langur, is a critically endangered primate found only on Cat Ba Island in Vietnam. This species is characterized by its distinctive golden fur and black face. The Cat Ba langur primarily inhabits limestone forests and is known for its arboreal lifestyle, spending most of its time in trees. With an estimated population of fewer than 70 individuals, the Cat Ba langur faces significant threats from habitat loss and hunting. Conservation efforts are underway to protect this unique species and its habitat, highlighting the importance of preserving biodiversity in the region.