Cat Ba Langur,
also known as Golden-headed Langur (fig.), is a species of Leaf
Monkey found only on the island of
Cat Ba in
Ha Long Bay (fig.).
Its body is mostly blackish to dark grey, with silvery
flanks on the hips and upper legs, and a bright golden to yellowish-white
head, shoulders and rump. It has a rather thick tail, that can measure up to
89 centimeters in length.