East Sumatran Banded Langur
CR

East Sumatran Banded Langur

Presbytis percura

Declining

Photo: Photo: (c) Irfan Nurarifin, some rights reserved (CC BY-NC), uploaded by Irfan Nurarifin

Overview

The East Sumatran banded langur, also known as the East Sumatran banded surili, is a species of monkey in the family Cercopithecidae. It was formerly considered a subspecies of the Raffles' banded langur Presbytis femoralis, but genetic analysis revealed it to be a separate species. Its range is restricted to the Riau Province of east-central Sumatra.

Due to its declining population and restricted range in small, isolated forests subject to high rates of deforestation, the IUCN declared it to be a critically endangered species in 2020.

Presbytis percura faces severe population decline primarily due to extensive deforestation and habitat fragmentation across its limited range in Peninsular Malaysia. Palm oil plantations and urban development have eliminated vast areas of lowland forest, while logging operations continue to degrade remaining forest fragments. The species' specialized diet and arboreal lifestyle make it particularly vulnerable to forest canopy disruption, with isolated populations showing reduced genetic diversity and reproductive success.

Threat summary

Habitat

This critically endangered langur inhabits primary and secondary lowland rainforests of Peninsular Malaysia, preferring the upper canopy layers of dipterocarp forests. The species requires continuous forest cover with mature trees for feeding and movement between forest patches.

Forest· majorForest - Subtropical/tropical mangrove vegetation· majorShrubland· majorGrassland· majorWetlands (inland)· major

Conservation measures underway

Site/area protectionSpecies recoveryAwareness & communicationsPolicies and regulations

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Frequently asked questions

Why is East Sumatran Banded Langur classified as Critically Endangered?
East Sumatran Banded Langur is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Presbytis percura faces severe population decline primarily due to extensive deforestation and habitat fragmentation across its limited range in Peninsular Malaysia. Palm oil plantations and urban development have eliminated vast areas of lowland forest, while logging operations continue to degrade remaining forest fragments. The species' specialized diet and arboreal lifestyle make it particularly vulnerable to forest canopy disruption, with isolated populations showing reduced genetic diversity and reproductive success.
Where does East Sumatran Banded Langur live?
East Sumatran Banded Langur occurs in Indonesia. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to East Sumatran Banded Langur?
The main threats to East Sumatran Banded Langur are 2.1, 5.3, 7.1, and ai-1. The full IUCN-classified threat record for this species is detailed on the species page.

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