The proboscis monkey (Nasalis larvatus) or long-nosed monkey is an arboreal Old World monkey with an unusually large nose, a reddish-brown skin color and a long tail. It is endemic to the southeast Asian island of Borneo and is found mostly in mangrove forests and on the coastal areas of the island.
This species co-exists with the Bornean orangutan and monkeys such as the silvery lutung. It belongs in the monotypic genus Nasalis.
Proboscis monkeys belong to the subfamily Colobinae of the Old World monkeys. The two subspecies are:
N. l. larvatus (Wurmb, 1787), which occupies the whole range of the species
N. l. orientalis (Chasen, 1940), restricted to north-east Kalimantan (See the gallery below)
However, the difference between the subspecies is small, and not all authorities recognise N. l. orientalis.
The species is known as monyet belanda in Malaysia or bekantan in Indonesia.
