Proboscis monkey (Nasalis larvatus) or proboscis monkey is an endemic species that inhabits mangrove forests on the island of Borneo (Indonesia, Malaysia and Brunei). In Kalimantan, Bekantan is also known as the Dutch Monkey, Pika, Bahara Bentangan, Raseng and Kahau (Supriatna et al. 2000). Based on phylogenetics, proboscis monkeys belong to the family: Cercopithecidae; genus: Nasalis; species: Nasalis larvatus (Wurmb 1787). At present, there are two subspecies Nasalis larvatus, namely: Nasalis larvatus larvatus and Nasalis larvatus orientalis.
Based on the IUCN Redlist (the International Union for Conservation of Nature and Natural Resources), Bekantan belongs to the category of Genting (Endangered). Proboscis monkeys also include primates listed in Appendix I of CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora) which means they cannot be traded.
The main threat of proboscis monkeys is habitat damage and illegal hunting. The conversion of forests and illegal logging and forest fires also have an influence on the decline in the proboscis monkey population in Kalimantan.