White-thighed Surili

The White-thighed Surili (Presbytis siamensis)  lives arboreal amongst the sub-montane forests. It is endemic to the Thai-Malay Peninsula, the Riau Archipelago, and Sumatra. They are characterized by the white patches located on the outside of their legs, which is what gives them their name. These primates are an important species for the diversity of forest environments in the Malaysian area.