Dusky Langur Trachypithecus obscurus

Dusky langurs—also known as spectacled langurs, dusky leaf monkeys, and spectacled leaf monkeys

Dusky Langur Trachypithecus obscurus


Malaysia; Myanmar; Thailand

Dusky Langurs are beautiful primate threatened by #palmoil #deforestation in #Malaysia #Myanmar and #Thailand. Help them by supporting @LangurPenang and #Boycott4Wildlife the supermarket brands destroying their home

Playful, gregarious and social Dusky Langurs prefer to live in closed primary forests, but they can also be found in old-growth secondary and disturbed forests, plantations, urban areas, and parks, suggesting that they are adaptable compared to other colobine species. They are mostly tree dwelling and active during the day. They face many threats including hunting and deforestation for palm oil and other agriculture. Help them every time you shop and #Boycottpalmoil #Boycott4Wildlife

Hunting for food is a major threat, as is fragmentation, habitat loss and degradation due to expanding oil palm plantations, agriculture, urbanization, and touristic development (Groves et al. 2013). In Peninsular Malaysia the langurs are frequent victims of road-kill (Boonratana 2003).

IUCN Red list


They consume a varied diet of fruit, flowers and other items. Individuals are able to take advantage of unripe fruit, which have chemical defenses, by the same means that they break down toxins in plant leaves, using the bacteria found in their digestive system (MacKinnon and MacKinnon 1980).

New-borns of Dusky Langurs have bright orange fur with pink skin. The orange coating begins to shed 2nd week after birth. At around 3rd week old, black-greyish hair starts to appear on the forehead, tail, and limb. By 4th month old, the head and back are black-greyish with only the cheeks showing traces of yellow. After six months, their entire bodies are light black-greyish, which grows darker as they become juveniles. The secondary layer of white-ish fluffy hair will only start growing at 6th month old.

The Dusky Langur is often found in single female-multiple male groups or in multiple male and female groups of around 10-20 individuals.

Help save this beautiful species from extinction

The Dusky Langur Project Panang

Further Information

ICUN endangered logo
Dusky langurs—also known as spectacled langurs, dusky leaf monkeys, and spectacled leaf monkeys

Boonratana, R., Ang, A., Traeholt, C. & Thant, N.M.L. 2020. Trachypithecus obscurus. The IUCN Red List of Threatened Species 2020: e.T22039A17960562. https://dx.doi.org/10.2305/IUCN.UK.2020-2.RLTS.T22039A17960562.en. Downloaded on 26 June 2021.

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Published by Palm Oil Detectives

Hi, I’m Palm Oil Detective’s Editor in Chief. Palm Oil Detectives is partly a consumer website about palm oil in products and partly an online community for writers, scientists, conservationists, artists and musicians to showcase their work and express their love for endangered species. I have a strong voice for creatures great and small threatened by deforestation. With our collective power we can shift the greed of the retail and industrial agriculture sectors and through strong campaigning we can stop them cutting down forests. Be bold! Be courageous! Join the #Boycott4Wildlife and stand up for the animals with your supermarket choices

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