Selangor silvered langur
Selangor silvered langur | |
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Mother and baby at Bukit Melawati in Kuala Selangor, Malaysia
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Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Primates |
Suborder: | Haplorhini |
Infraorder: | Simiiformes |
Family: | Cercopithecidae |
Genus: | Trachypithecus |
Species group: | Trachypithecus cristatus group
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Species: | T. selangorensis
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Binomial name | |
Trachypithecus selangorensis |
The Selangor silvered langur (Trachypithecus selangorensis) is a species of
Description
The Selangor silvered langur has a gray body with a black face and black feet and hands.
Infants are born with a very different color pattern than the adults. They have bright orange fur with white faces, hands and feet.[8] The infant coloration transforms to the adult coloration over its first 3 to 5 months, starting with the head, hands and feet.[8] All members of the group participate in the care of the infants, including females other than the mother and the dominant male.[8] One theory for the reason for the orange infant coloration is that it may attract other females to help look after the infant.[9]
Distribution
This langur's distribution is restricted to the west coast of
Behavior
Like most leaf monkeys, the Selangor silvered langur typically lives in groups with a single adult male and multiple adult females and their juvenile offspring.[16] A study by Sterck and Van Hooff found that it was more likely than most to live in groups with more than one adult male.[16] In some cases, a former dominant male was permitted to stay with the group after a younger male became dominant.[16] In some cases, new young adult males were permitted to join the group without toppling the dominant male. In other cases younger males, presumably sons of the dominant male, were permitted to stay with the group for some time after reaching adulthood.[16] More typically young males are ejected from the group by the dominant male upon reaching adulthood.[16] Similarly aged males tend to leave their natal group together and join new groups together.[16] Groups are territorial, with little overlap between the territories of different groups.[8] A study by Lord Medway indicated that Selangor silvered langur infant births do not show a seasonal pattern[17]
Besides feeding and caring for infants, the activity budget of Selangor silvered langurs includes playing, transportation, resting, vocalizing and grooming.[8] Juveniles of both sexes participate in most of the playing and even infants that are only a few weeks old engage in play.[8] Play can include wrestling and other play fighting and juvenile males are the most active participants in this type of play.[8] A study by Bernstein at Bukit Melawati found that much play occurs on the ground and that whenever the group was on the ground and undisturbed the juveniles engaged in play.[8] Monkeys of all ages, including infants and the dominant male, engage in grooming.[8] Grooming sessions typically involve two monkeys but sometimes involve three or four.[8] At times of distress the monkeys often embrace each other.[8]
A study by Lee Harding observed that when Selangor silvered langurs encounter the smaller
Conservation status
A study by Khan published in 1978 suggested that the population in West Malaysia had declined from about 6,000 individuals to about 4,000 between 1958 and 1975.[3]
References
- doi:10.2305/IUCN.UK.2021-3.RLTS.T205911038A205911065.en. Retrieved 17 July 2022.)
{{cite journal}}
: CS1 maint: multiple names: authors list (link - ^ PMID 18406631. Retrieved 2018-09-01.
- ^ .
- ^ a b Roos, C.; Boonratana, R.; Supriatna, J.; Fellowes, J.R.; Groves, C.P.; Nash, S.D.; Rylands, A.B. & Mittermeier, R.A. (2014). "An updated taxonomy and conservation status review of Asian primates" (PDF). Asian Primates Journal. 4 (1): 2−38. Retrieved 2018-08-30.
- ISBN 9780123786333.
- ISBN 9781317327103.
- ^ ISBN 978-0964882508.
- ^ JSTOR 4533239.
- ISBN 9780674043800.
- ^ ISBN 9781909612242.
- ISBN 9781743216590.
- ^ "Bukit Melawati". visitselangor.com. 2017-04-12. Retrieved 2018-08-31.
- ^ "Bukit Melawati – Kuala Selangor , Selangor Malaysia". JourneyMalaysia.com. Retrieved 2018-08-31.
- ^ Leong, Ewe Paik (2017). "More than fireflies in Kuala Selangor". New Straits Times. Retrieved 2018-08-31.
- ^ a b c Md. Zain, Badrul Munir; Mohd. Daut, Norlinda & Md. Nor, Shukor (2009–2010). "Characterizing Silvered Leaf Monkey–Visitor Interactions at Bukit Melawati, Kuala Selangor, Malaysia" (PDF). The Journal of Wildlife and Parks. 26: 83–94. Retrieved 2018-09-01.
- ^ ISBN 9780521658461.
- JSTOR 1378413.