About Presbytis siamensis (Müller & Schlegel, 1841)
The white-thighed surili (Presbytis siamensis) is a primate species belonging to the Old World monkey family Cercopithecidae. It is an arboreal species that lives in sub-montane forests, and is endemic to the Thai-Malay Peninsula, the Riau Archipelago, and Sumatra. Four subspecies of white-thighed surili are recognized: the nominate subspecies P. s. siamensis, as well as P. s. cana, P. s. paenulata, and P. s. rhionis. This species gets its common name from the characteristic white patches found on the outer sides of its legs. It may also be called the pale-thighed langur or pale-thighed surili. This primate is an important species for forest environmental diversity in the Malaysian region. As an arboreal species, P. siamensis inhabits subtropical and tropical forest environments, including moist lowland forests and swamp areas. It can also live in non-forest terrestrial environments such as rural gardens. Its distribution centers mainly on the Malay Peninsula, and it can also be found in Sumatra and parts of Thailand.
