White-fronted surili

The white-fronted surili, Presbytis frontata, is a species of Old World monkey in the family Cercopithecidae that is endemic to the island of Borneo, in Indonesia, Malaysia and possibly Brunei. Its body is mainly grey-brown, with a distinct white spot on the forehead, a greyish chin and lower cheeks, a yellowish-grey tail, and blackish hands, feet, brow, crown crest and cheeks. A tall sagittal crest leans forward on the skull. Adult males average about 5.67 kilograms and females about 5.56 kilograms. Two subspecies are described, Presbytis frontata frontata, which is brownish with darker limbs, and Presbytis frontata nudifrons, which is dark greyish with a squarish forehead spot split by a line of short black hairs. The species is diurnal and arboreal and feeds mainly on leaves, preferring immature ones, along with fruit and seeds. Groups of 10 to 15 live in tall lowland and hill dipterocarp forest below 300 metres, in south-east Borneo east of the Barito River and, for the subspecies nudifrons, in central Sarawak. It is listed as Vulnerable, because its population has fallen by more than 30 percent over about 30 years through hunting for meat and traditional medicine and through the loss of forest to oil palm plantations; it is protected by Indonesian law and totally protected in Sarawak.