Female Dusky Langur (Trachypithecus obscurus) with infant
The Dusky Langur (Trachypithecus obscurus) is a large, handsome species of primate found in Malaysia, Thailand and Myanmar. This species is (confusingly!) known by a number of other common names including Spectacled Langur, Spectacled Leaf Monkey and Dusky Leaf Monkey. They are a species of ‘lutung’, part of a group of Old World monkeys of the genus Trachypithecus.
Generally quieter than other primates they share their range with such as gibbons and macaques, langurs often spend much of the day quietly browsing foliage in the mid-storey of lowland and hill rainforests. They make a variety of vocalizations including soft grunts and hoots and much louder guttural snorts, barks and alarm calls. Often the best indicator of their their presence is the loud crashing sounds of branches as they leap from one tree to another.
This species is classified as ‘Endangered’ on the IUCN Red List due to its decreasing populations and vulnerability to habitat loss and hunting.
Listen to Dusky Leaf Monkey Sounds
Dusky Langur – Typical nasal grunts
SD13 This first sample features the typical nasal grunting calls. Recorded in Ulu Muda, Malaysia.
Dusky Langur – Hooting calls
XC172224 These hooting calls are often heard at first light as groups start to become active. Recorded in Kaeng Krachan Natioanl Park, Thailand.
Dusky Langur – Alarm/agitation calls
MX174a Similar to the two-note nasal grunts, the alarm or agitation calls appear to be faster and shorter. Recorded in Kaeng Krachan National Park, Thailand.
Dusky Langur – Typical nasal grunts at night
B03m A further example of the typical nasal grunting calls. This sample was recorded at night in Taman Negara National Park, Malaysia.
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Primate sounds from South-east Asia:
- Orangutan, Bornean (Pongo pygmaeus)
- Gibbon, Agile (Hylobates agilis)
- Gibbon, Mueller's (Hylobates muelleri)
- Gibbon, Pileated (Hylobates pileatus)
- Gibbon, White-handed (Hylobates lar)
- Langur, Banded (Presbytis robinsoni)
- Langur, Dusky (Trachypithecus obscurus)
- Leaf Monkey, Red (Presbytis rubicunda)
- Macaque, Long-tailed (Macaca fascicularis)
- Siamang (Symphalangus syndactylus)
This species is also known as Spectacled Leaf Monkey because of its distinctive white eye-rings and the preference for a predominantly leafy diet!