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Grey Langur

Common name for a species of Leaf Monkey with the scientific name Trachypithecus crepusculus and found in Southwestern China, Laos, Myanmar, Thailand, and northern Vietnam. It was previously considered a subspecies of the Phayre's Leaf Monkey (Trachypithecus phayrei - fig.) and listed as Trachypithecus phayrei crepusculus, yet the Grey Langur is now recognized as a distinct species, based on molecular data. However, in Thai it is known as kaang waen thin neua, i.e. ‘Northern Spectacled Langur’, the same designation also used for the Phayre's Leaf Monkey and hence no differentiation is made in the name. To add to the confusion, the name Grey Langur is also used for the Black-faced Langur (Presbytis entellus), found in India. Hence, to avoid confusion, it may sometimes be referred to as Indochinese Grey Langur. It has an overall pale grey fur, a long tail, a bluish-grey face with white circles around the eyes, and white skin at the mouth. It is also similar to the Dusky Leaf Monkey (fig.), but has a lighter fur. Like other Leaf Monkeys, Grey Langurs are herbivorous, feeding primarily on leaves, fruits and buds, and hence spend most of their lives in the canopy of trees. Also spelled Gray Langur.