Spectacled Langur (Trachypithecus obscurus) lives in forest across Indian Subcontinent. It feeds on leaves and fruits. Its conservation status is Endangered.
Fascinating facts about the Spectacled Langur
- The dusky leaf monkey was listed as endangered by the IUCN in 2015 because its numbers are falling. Researchers note that habitat loss, poaching and expanding anthropogenic land use are the main drivers of this decline. Ongoing land-use change in Southeast Asian forests has further eroded the species' natural habitat, deepening the population drop.
- A pair of dusky leaf monkeys that likely swam from Malaysia was seen in Singapore in January 2020. The two monkeys chased away a group of eleven Raffles' banded langurs during the encounter. Researchers think the primates can reach Singapore by swimming, as similar sightings in August 2019 were near the water border with Malaysia. Although they occasionally appear, their presence is regarded as natural colonisation rather than an invasive invasion caused by humans.
- Among 25 male dusky leaf monkeys, the weight of one testicle reliably predicts the weight of the other, showing a direct correlation that lets scientists estimate the partner organ's size from a single measurement. This relationship was not found in females, as ovarian weights did not provide a statistically significant basis for prediction. The finding highlights a unique aspect of male reproductive anatomy in this sexually dimorphic species.
- When a conflict erupts, dusky leaf monkeys can restore calm in roughly a minute, often with either the aggressor or the recipient initiating an embrace. This rapid reconciliation was observed in a 1996 study that measured the time taken after fights. The speed of peace-making is notably faster than that recorded for many other primate species, highlighting a distinctive social flexibility in this leaf-eating monkey.
- Male dusky leaf monkeys average 7.39 kilograms, while females average 6.47 kilograms, confirming a clear sexual size difference. The study sampled 25 males and 44 females, showing females are about 12% lighter than their male counterparts. This dimorphism is consistent across the species and reflects the broader pattern of size disparity between the sexes.
Sources
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At a glance
RangeIndian Subcontinent
HabitatForest
DietLeaves and fruits
About the Spectacled Langur
In the lush canopies of the tropical forests, the spectacled langur moves with effortless elegance, its slender limbs weaving a mesmerizing dance through the dappled light and shadow. With eyes ringed by dark, expressive fur, this agile primate navigates its arboreal realm with a quiet confidence, pausing occasionally to survey its surroundings with a piercing gaze. As it leaps from branch to branch, its grey-brown coat blends seamlessly into the forest's muted palette, rendering it all but invisible, save for the fleeting glimpse of its distinctive spectacle-like markings.
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