The Banded Leaf Monkey is a species of monkey which is endemic to the Thai-Malay Peninsula and the island of Sumatra. It is diurnal and is found in mixed mangrove, primary freshwater, riverbank, primary lowland logged, scrub-grassland riverbank, and secondary riverbank habitats. Arboreal and gregarious, it is primarily frugivorous, as its diet consists principally of fruit and immature leaves. It is found in taller trees of swampy peat forest in Malay Peninsula, while in Singapore it is limited to primary, secondary, swamp, and dryland rainforests of the Central Catchment Nature Reserve where less than 40 individuals still struggle to exist. Considering the extensive habitat loss that has taken place within the range of the species, there is reason to believe that this species is in decline, probably at a rate of less than 30% over three generations (approximately 30 years), thus qualifying if for listing as Near Threatened. Additionally, infant mortality rate is extremely high for these monkeys - probably more than 50 per cent, which greatly affects their replacement numbers. Deforestation and conversion of habitat would appear to be the major threats to this species. It is particularly affected by oil palm plantations, which are expanding very rapidly within its range. In Singapore, which cites the monkey as precious to their history, there is an effort to protect the remaining forest habitats, and to police its habitat against poaching and human disturbances.