A forest-dwelling monkey of the Malay Peninsula, known for pale eye markings and a leaf-based diet.
Its coat varies by region from brown to gray or black, with paler fur underneath, on the hind legs, and on the tail. The gray face often has pale rings around the eyes. Infants are yellow to orange at birth and turn gray or brown as they grow.
At Bukit Soga Perdana in Johor, southern Peninsular Malaysia, Dusky Langurs live in a 49.3-hectare forest reserve surrounded by urban development. Moving took the largest share of recorded activity, followed by feeding and resting. Their activity included moving, feeding, resting, calling, conflict and helping to care for young. The study also recorded sleeping and core-tree locations.
From November 2017 to February 2018, activity varied with surrounding conditions, including the presence or absence of people. The sampled group was semi-wild and not habituated to visitors. Grooming increased from 8.23% in November to 13.86% in February, and the authors proposed wildlife tourism as a way to conserve the forest.
An extinction-risk assessment has not been added yet.
Across Peninsular Malaysia, the paper identifies agricultural conversion, habitat fragmentation, pet trade and other development as threats. At Bukit Soga Perdana the forest is fragmented by urban development; wildlife tourism is proposed as one conservation approach.