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Citizen Scientist's Eight-Year Search Highlights Singapore's Critically Endangered Langurs

EnvironmentSociety4/23/2026
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A dedicated volunteer has spent eight years monthly searching for the Raffles' banded langur in Singapore's Lower Peirce Reservoir Park. The species is critically endangered, with fewer than 80 individuals surviving in Singapore's fragmented forests. This long-term effort highlights the persistence of wildlife in urbanized landscapes.

Facts First

  • A volunteer has searched monthly for eight years for the Raffles' banded langur at Lower Peirce Reservoir Park.
  • The Raffles' banded langur is critically endangered with a global population estimated between 200 and 250 mature individuals.
  • Fewer than 80 of these langurs are located in Singapore.
  • Singapore's primary forest cover is now less than 1% of its original extent.
  • Small groups of langurs have survived in isolated forest fragments following rapid urbanization since the 1960s.

What Happened

Lay Hoon has visited Lower Peirce Reservoir Park monthly for eight years to search for the Raffles’ banded langur (Presbytis femoralis). Lower Peirce Reservoir Park is a 10-hectare patch of maturing secondary forest located northeast of Singapore’s Central Catchment Nature Reserve. The Raffles’ banded langur is a leaf-eating monkey found in pockets of fragmented forest in Singapore and the southern tip of Peninsular Malaysia. It is listed as critically endangered on the IUCN Red List, with a total global population estimated to be between 200 and 250 mature individuals. Fewer than 80 of these langurs are located in Singapore.

Why this Matters to You

This long-term citizen science effort demonstrates that pockets of wildlife can persist even in highly urbanized environments like Singapore. You may find similar opportunities for observation and conservation in green spaces near you. The survival of these langurs suggests that remaining forest fragments, even secondary ones, can be vital for biodiversity. This story may encourage you to look more closely at the natural resilience in your own community.

What's Next

The continued monthly searches by volunteers like Lay Hoon are likely to provide ongoing data on the langur population's health and distribution. Conservation efforts for the Raffles’ banded langur will need to focus on protecting and connecting the fragmented forest habitats where they survive. Further research may be needed to understand how these small groups are adapting to their isolated environments.

Perspectives

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Local Observers note that the presence of langurs is often signaled by sound before they are visually spotted, with one observer stating, “Before we see the langurs, we usually hear them.”
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Environmental Analysts contend that the scale of habitat destruction in Singapore over the last two hundred years is massive, suggesting that "the extent of habitat loss in Singapore over the past two centuries cannot be overstated."