Hose’s langur (Presbytis hosei)

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Hose's langur adult and infant
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Hose’s langur fact file

Hose’s langur description

KingdomAnimalia
PhylumChordata
ClassMammalia
OrderPrimates
FamilyCercopithecidae
GenusPresbytis (1)

Hose’s langur is a relatively small, slim-built primate (5), characterised by a high forehead and a prominent, forward-leaning crest down the centre of the crown (3) (6). The colour of the coat varies with the subspecies, but is predominantly grey on the back, white on the stomach and chest, and blackish on the hands and feet. The face is pink, with a distinct black band marking each cheek. Infants are easily distinguished, being white with black lines down the back and across the shoulders (3). Groups (probably the adult male) sometimes give a unique gargling call (7).

Also known as
grey langur, grey leaf monkey, grey sureli, Hose’s leaf monkey.
French
Semnopithèque De Hose.
Spanish
Langur De Hose.
Size
Head-and-body length: 48 – 56 cm (2)
Tail length: 65 – 84 cm (2)
Average male weight: 6 – 7 kg (3)
Average female weight: 5.5 – 6 kg (3)
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Hose’s langur biology

Hose’s langur is a diurnal species with a primarily folivorous diet, equipped with a specialised sacculated stomach and enlarged salivary glands to assist in the breakdown of tough leaf material. However, the species will also feed on fruits, seeds and flowers, as well as on the eggs and nestlings of birds such as the gray-throated babbler (Stachyris nigriceps) (3).

In Sabah and Brunei, group sizes tend to range from six to eight individuals, although 12 or more have reported from Temburong and solitary individuals do occur (3) (7). Groups contain one adult male and two or more adult females, and mating is polygynous (3) (7). Hose’s langurs give birth to single offspring (3), which are weaned by one year and fully mature by four to five (5), with males dispersing from their natal groups (7).

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Hose’s langur range

Endemic to the island of Borneo (6), in the countries of Brunei Darussalam, Indonesia (Kalimantan), and Malaysia (provinces of Sarawak and Sabah) (1). P. h. hosei occurs in Sarawak (1), but may only be found around the lower Baram river (3). P. h. everetti is found along the northwest coast of Sabah into Brunei, while P. h. sabana is confined to central and eastern Sabah and south-western to Kalabakan (3). This subspecies may also be found in far north-eastern Kalimantan. P. h. canicrus is recorded definitely only from Gunung Talisayan and Karangan in East Kalimantan, but is probably also present in Kutai (7).

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Hose’s langur habitat

This arboreal monkey largely moves through the middle levels of the forest canopy, occasionally descending to the ground to visit natural mineral sources (3). Primary and, less abundantly, secondary forests are inhabited, in an altitudinal range of 1,000-1300 m. The species will also occasionally enter plantations (3) (7).

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Hose’s langur status

Classified as Vulnerable (VU) on the IUCN Red List (1) and listed under Appendix II of CITES (4). Four subspecies are recognised: Hose’s grizzled langur (P. h. hosei) is classified as Data Deficient (DD), Everett’s grizzled langur (P. h. everetti) is classified as Vulnerable (VU), while the Miller’s grizzled langur (P. h. canicrus) and the crested grizzled langur or saban grizzled langur (P. h. sabana) are classified as Endangered (EN) on the IUCN Red List (1).

IUCN Red List species status – Vulnerable

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Hose’s langur threats

Hunting and deforestation pose critical threats to this species across its range. Indeed, the reputed medicinal value of the ‘bezoar’ stones sometimes formed in the monkey’s guts makes this species a target even for hunters uninterested in its meat (6). Interviews with local hunters indicate that hunting for these bezoar stones was the primary reason for the 50 – 80% decline recorded for the species between 1996 and 2003 in Kayan Mentarang National Park, East Borneo, where the forest has remained in fairly pristine condition (8). In this case, a merchant calling at a nearby village in 1998 had reportedly guaranteed to purchase them, sparking excessive hunting of Hose’s langur in the area, to such an extent that 3 years later this hunting was no longer economically viable (8). As a result of habitat loss and hunting pressure, Miller’s grizzled langur (P. h. canicrus) is thought to be critically endangered, or even extinct. Thus, it is listed as one of the world’s 25 most endangered species, although no quantitative surveys have yet been undertaken. Hose’s grizzled langur (P. h. hosei) is considered by many to be in a worse predicament and even more likely to be extinct, although there is a small chance that it exists in the northern part of the Similajau National Park in central coastal Sarawak. Populations may also exist in Brunei, which has suffered much less hunting and deforestation, but hybridization with Everett’s grizzled langur (P. h. everetti) could be a potential issue in this area (6).

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Hose’s langur conservation

Hose’s langur is fully protected in Sarawak, prohibiting individuals from keeping them as pets, or hunting, capturing, killing, selling, importing or exporting them, with stiff penalties of a fine and two years imprisonment if caught (7). The species appears in a few protected areas, such as Kutai National Park and Kayan Mentarang National Park, but the protection offered is frequently inadequate and laws remain unenforced. Indeed, despite being found in national parks, only an estimated 5% of the Kutai National Park forest has escaped logging, illegal settling, industrial development and fire (6), and active protection of Kayan Mentarang National Park has clearly been lacking, having suffered heavily from hunting pressure (8). In such cases, National Park ‘protection’ alone does not guarantee preservation, and more active protection of wildlife against hunting and habitat destruction is desperately required to prevent the extinction of this species. Sadly, it may already be too late for certain subspecies.

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

For more information on Hose’s langur see:

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Authentication

Authenticated (12/03/2006) by Matthew Richardson, independent primatologist and writer.

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Glossary

Arboreal
Living in trees.
Bezoar
A ball of swallowed foreign material (usually hair or fiber) that cannot be digested and collects in the stomach.
Diurnal
Active during the day.
Endemic
A species or taxonomic group that is only found in one particular country or geographic area.
Folivorous
Leaf eating.
Natal
Site or group of birth.
Polygynous
In animals, a pattern of mating in which a male has more than one female partner.
Sacculated
Formed with or having saclike expansions.
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References

  1. IUCN Red List (June, 2009)
    http://www.redlist.org
  2. Richardson, M. (2006) Pers. comm.
  3. The Primata (January, 2006)
    http://www.theprimata.com/presbytis_hosei.html
  4. CITES (November, 2005)
    http://www.cites.org
  5. Paleaorama.com (January, 2006)
    http://www.paleorama.com/Mammals-P/Presbytis.php
  6. Primates in Peril: The World’s 25 Most Endangered Primates 2004 – 2006 (January, 2006)
    http://portals.conservation.org/downloads/storedfile/Document/top252004final.pdf
  7. Forest Department Sarawak (January, 2006)
    http://www.forestry.sarawak.gov.my/forweb/wildlife/mgmt/tpa/tprotsp.htm
  8. Nijman, V. (2005) Decline of the endemic Hose's langur Presbytis hosei in Kayan Mentarang National Park, East Borneo. Oryx, 39: 223 - 226.
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Image credit

Hose's langur adult and infant  
Hose's langur adult and infant

© Cede Prudente

Cede Prudente
North Borneo Safari Sdn. Bhd.
Lot 4 Ist Floor Block 22
Bandar Indah Mile 4
90000 Sandakan
Sabah
Malaysia
Tel: +6 (089) 235525
Fax: +6 (089) 235526
nbsafari@streamyx.com
http://www.cedeprudente.com

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