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.[3] This species co-exists with the Bornean orangutan.[4] It belongs in the monotypic genus Nasalis.[5]