Common name for a
species of Leaf Monkey with the scientific
name Trachypithecus crepusculus and found in
Vietnam. It was previously
subspecies of the
Phayre's Leaf Monkey (Trachypithecus
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
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.