Sabah Grizzled Langur Presbytis sabana
Sabah Grizzled Langur Presbytis sabana
Red List Status: Endangered
Location: Malaysia (Sabah), Indonesia (North Kalimantan)
This elusive primate lives in lowland, riparian, montane, and evergreen forests of northern Borneo, including protected areas such as the Danum Valley, Tabin Reserve, and the Kinabatangan region.
The Sabah Grizzled Langur Presbytis sabana, also known as the Saban Grizzled #Langur or Crested Grizzled Langur, is a strikingly beautiful leaf #monkey found only in #Borneo. Their #Endangered status is a direct result of extensive habitat destruction caused by deforestation, out-of-control palm oil expansion, and #hunting—particularly for bezoar stones used in traditional medicine. With fragmented populations and little known about their behaviour or numbers, urgent action is needed to prevent their extinction. Use your wallet as a weapon. Avoid #palmoil when you shop and demand an end to wildlife trafficking and forest destruction. #BoycottPalmOil #Boycott4Wildlife #Vegan
Sabah Grizzled #Langurs live in the treetops of #Sabah #Malaysia 🐒🐵🇲🇾 Their main threats are #palmoil and #meat agriculture #deforestation. Help to protect these elegant monkeys when you #BoycottPalmOil 🌴🩸🔥☠️🤮🧐🙊⛔️#Boycott4Wildlife @palmoildetect https://palmoildetectives.com/2021/01/25/msaban-grizzled-langur-presbytis-sabana/
Share to BlueSky Share to TwitterAppearance and Behaviour
The Sabah Grizzled Langur is a captivating primate with a thick coat of grey, grizzled fur and a pale belly, sharply contrasted by black hands and feet. A pointed crown of fur rises from their head, giving them a distinct, almost regal look. Their spade-shaped, pale-pinkish faces are framed by dark rings around wide, expressive eyes—an appearance that makes them instantly memorable to anyone lucky enough to see one.
These langurs are diurnal and arboreal, spending most of their lives high in the forest canopy. At night, they retreat to the upper branches of emergent trees to sleep, likely as a defence against predators. They are nimble and versatile movers, walking on all fours, leaping, climbing, and even hanging suspended beneath branches. Their daily lives involve foraging, grooming, resting, and socialising in cohesive groups that typically consist of one dominant male and several adult females with their young.
Diet
Sabah Grizzled Langurs are primarily folivores, feeding on a wide range of leaves, young shoots, and unripe seeds. They also eat fruit, flowers, buds, insects, bird eggs, and mineral-rich mud to supplement their diet. Their complex, multi-chambered stomachs ferment leafy material efficiently, allowing them to extract maximum nutrition from tough plant matter.
The diet of the Sabah Grizzled Langur shifts based on the level of forest disturbance. In undisturbed forests, leaves dominate their intake, but in logged areas, they consume more fruit and seeds. This adaptability may be crucial to their survival in fragmented landscapes.
Reproduction and Mating
This species follows a polygynous mating system, with a single adult male having exclusive breeding access to the females in the group. Breeding appears to occur year-round, but births peak between July and October. After a gestation of five to six months, the female gives birth to a single infant.
Infants are born with paler fur that darkens over time. They are weaned at around 11 months and become subadults between 21 and 36 months. Both males and females leave their natal groups upon reaching sexual maturity at about three years of age, either joining new groups or forming their own.
Geographic Range
Sabah Grizzled Langurs are endemic to the island of Borneo and are found only in Sabah (Malaysia) and northern parts of Indonesian Kalimantan. They inhabit evergreen, lowland, montane, and riverine forests, as well as selectively logged areas and tree plantations. Though once considered a subspecies of Presbytis hosei, they are now recognised as a distinct species. Populations are scattered and fragmented, with some surviving in protected areas like Danum Valley and the Maliau Basin, but others are highly vulnerable to extinction.
Threats
• Palm oil deforestation, monoculture expansion and habitat fragmentation
Large-scale clearing of Borneo’s forests for palm oil plantations has severely reduced the habitat of Presbytis sabana. This deforestation not only destroys the canopy cover they rely on for movement and shelter but also creates isolated forest patches that hinder gene flow and increase vulnerability to inbreeding and local extinction. Even selectively logged areas can remove critical roosting trees and food sources, leading to population collapse over time.
• Hunting for their meat and bezoar stones
Local hunting poses a grave threat to this species. Bezoar stones—calcified objects sometimes found in the gastrointestinal tracts of langurs—are falsely believed to have medicinal properties and fetch high prices in illegal markets. As a result, these langurs are hunted both for meat and for supposed curative use, putting intense pressure on already dwindling populations.
• Lack of enforcement in protected areas
While some populations live in conservation zones, many of these are inadequately protected. Illegal logging, poaching, and encroachment continue within the boundaries of national parks and reserves. Without sufficient monitoring, resources, and community involvement, these areas offer little real safety for the langurs.
• Low reproductive rate and slow population recovery
Like many primates, Sabah Grizzled Langurs have slow reproductive cycles, giving birth to a single infant every one to two years. This low birth rate means that even small increases in mortality can cause long-term population declines. Combined with hunting and habitat loss, this makes recovery especially difficult without urgent conservation action.
Take Action!
The fate of the Sabah Grizzled Langur is partially tied to our consumer choices. Avoid products that contain palm oil, especially those contributing to Bornean deforestation. Never support the exotic animal trade or products made from endangered species. Support indigenous-led conservation efforts and protect Southeast Asia’s remaining rainforests. #BoycottPalmOil #Boycott4Wildlife #Vegan #BoycottMeat
FAQs
How many Sabah Grizzled Langurs are left?
Exact population numbers are unknown due to a lack of comprehensive surveys, but the IUCN lists them as Endangered and rapidly declining. Fragmentation of their range and localised hunting make many populations highly vulnerable, and some may already be functionally extinct.
What is the lifespan of Presbytis sabana?
While the exact lifespan of Presbytis sabana is not documented, related langurs typically live around 20–25 years in the wild. Infant mortality may be high in disturbed habitats, especially where hunting pressure is intense.
Why are bezoar stones a threat?
Bezoar stones are hard masses found in the intestines of some langurs, falsely believed to have healing powers in traditional medicine. This belief drives illegal hunting, even though scientific evidence shows these stones have no proven medical value. Killing langurs for this purpose is both cruel and contributes directly to their extinction.
How are Sabah Grizzled Langurs affected by palm oil?
Palm oil plantations are a major cause of deforestation in Borneo. These plantations clear vast areas of native forest, severing the canopy corridors that langurs use to travel. Even plantations that claim to be ‘eco-friendly’ contribute to ecosystem collapse by fragmenting habitat and displacing wildlife.
Do Sabah Grizzled Langurs make good pets?
No. These langurs are not suited to captivity and have not been documented in zoos or pet markets. Their specialised diet and social needs cannot be met outside the wild. Keeping langurs as pets is illegal, unethical, and further threatens their survival.
Support the conservation of this species
This animal has no protections in place. Read about other forgotten species here. Create art to support this forgotten animal or raise awareness about them by sharing this post and using the #Boycottpalmoil #Boycott4Wildlife hashtags on social media. Also you can boycott palm oil in the supermarket.
Further Information
Nijman, V. (2017). Group composition and monandry in grizzled langurs, Presbytis comata, on Java. Folia Primatologica, 88(2), 237–254. https://doi.org/10.1159/000478695
Ramlee, H. (2013). Distribution, ecology and systematics of Presbytis hosei and other leaf monkey species in North Borneo [PhD thesis, Australian National University]. Open Research Repository. https://openresearch-repository.anu.edu.au/items/26fbc1b7-b536-427c-a8d2-62984e69b43e
Setiawan, A. & Traeholt, C. 2020. Presbytis sabana. The IUCN Red List of Threatened Species 2020: e.T39810A17987041. https://dx.doi.org/10.2305/IUCN.UK.2020-2.RLTS.T39810A17987041.en. Downloaded on 25 January 2021.
Wikipedia contributors. (n.d.). Sabah grizzled langur. Wikipedia. Retrieved from https://en.wikipedia.org/wiki/Sabah_grizzled_langur
Sabah Grizzled Langur Presbytis sabana
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