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Gursky’s Spectral Tarsier Tarsius spectrumgurskyae

Gursky’s Spectral Tarsier Tarsius spectrumgurskyae

IUCN Red List Status: Vulnerable

Location: Indonesia (Sulawesi)

Found across the northern peninsula of Sulawesi in Indonesia, including from the northern tip to the Isthmus of Gorontalo, in primary forest, mangroves, and disturbed habitats with dense cover.

The Gursky’s spectral tarsier Tarsius spectrumgurskyae, also known locally as Wusing, is a recently recognised species of tarsier from northern Sulawesi. Listed as Vulnerable by the IUCN, they have lost more than 30% of their habitat in the past two decades. #Deforestation for #palmoil and #timber, agricultural encroachment, illegal logging, and the #pettrade all threaten their fragile populations. Their survival depends on wild spaces thick with shrubby undergrowth—the very places being rapidly erased. If you love unique #primates like the spectral #tarsier, use your voice and wallet to protect their forest home. #BoycottPalmOil #Boycott4Wildlife

https://youtu.be/FqrauXhLBcY

Known locally as ‘Wusing’, Gursky’s Spectral #Tarsiers have enormous moon-like eyes to help them see in dark forests 🌛👀😽 #Palmoil and the #pet trade are serious threats. Help them survive when you #Boycottpalmoil 🌴🚜❌ #Boycott4Wildlife @palmoildetect https://palmoildetectives.com/2026/02/22/gurskys-spectral-tarsier-tarsius-spectrumgurskyae/

Found in tree hollows of #Sulawesi #Indonesia, tiny #primates 🐵🧐 Gursky’s Spectral #Tarsiers are #carnivores with their food, #insects 🪲🦗 being poisoned by #palmoil and #pesticides ☠️ Fight for them! #Boycottpalmoil #Boycott4Wildlife @palmoildetect https://palmoildetectives.com/2026/02/22/gurskys-spectral-tarsier-tarsius-spectrumgurskyae/

Appearance & Behaviour

Gursky’s spectral tarsiers also known locally as ‘Wusing’ are hauntingly beautiful tiny #primates with enormous, forward-facing eyes that shine like twin moons in the night. These tiny nocturnal primates have a soft, greyish pelage and elongated fingers adapted for gripping tree branches. They are famed for their extreme leaping ability, known as vertical clinging and leaping (VCL), allowing them to spring through the forest canopy with precision and grace.

Highly social and vocal, they live in monogamous or polygamous groups of 2–11 individuals. At dawn, their eerie territorial duets echo through the forest just before they return to their sleeping sites in dense foliage or tree cavities. They are shy, elusive, and deeply dependent on forest structure to hide, hunt, and sleep.

Threats

Habitat Loss from Illegal Logging

The primary threat to Gursky’s spectral tarsier is the ongoing destruction of Sulawesi’s forests due to illegal logging. These small nocturnal primates depend on dense understorey vegetation and tree cavities for shelter and foraging. When forests are cleared, their sleeping sites vanish and prey becomes scarce, forcing them into smaller, fragmented patches of habitat. Even moderate disturbance causes a sharp drop in population density—from over 150 individuals/km² to as few as 45 in degraded areas (Merker, 2003).

Agricultural Expansion and Palm Oil Plantations

Much of the Gursky’s Spectral Tarsier’s lowland habitat has already been converted to palm oil and timber agriculture, and expansion continues. Between 1990 and 2000, 15.26% of Sulawesi’s forests were cleared for crops, with at least 10% more lost since then (Salim, pers. comm. in IUCN, 2020). Palm oil plantations are one of the main drivers of this forest conversion. Although the species can survive in agroforestry and disturbed areas, their numbers drastically decline when natural vegetation is replaced with monocultures.

Pesticide Exposure from Nearby Farms

Chemical pesticides used in adjacent agricultural zones contaminate the tarsiers’ insect prey, leading to bioaccumulation and poisoning. Tarsiers consume a diet entirely composed of live animal prey, mostly insects, which makes them highly vulnerable to pesticide residues. Ingestion of contaminated insects can lead to neurological damage, reproductive failure, or death, further weakening populations in edge habitats near farmlands.

Predation by Domestic Animals

Domestic dogs and cats introduced into forested areas pose a significant predation risk to tarsiers. These animals often accompany humans into disturbed or agricultural areas, where they hunt or scavenge. Tarsiers are small-bodied, slow on the ground, and often descend to low levels of the forest, making them easy targets. Predation by pets fragments already-vulnerable populations and disrupts group dynamics.

Illegal Capture for the Pet Trade

Although not widespread, the illegal pet trade is an emerging threat. Gursky’s spectral tarsiers are occasionally taken from the wild to be sold in local markets or online. These sensitive, nocturnal animals suffer tremendously in captivity, often dying due to stress, malnutrition, or improper care. Removing them from the wild also breaks apart family groups and contributes to long-term population decline.

Geographic Range

Gursky’s spectral tarsier is endemic to Indonesia, restricted to northern Sulawesi, from the northern tip of the peninsula to the Isthmus of Gorontalo. Their habitat includes lowland primary forests, secondary growth, mangroves, and areas with some human disturbance, such as agroforestry and selectively logged landscapes. However, their density drops dramatically as habitat degradation increases.

Diet

Their diet is 100% carnivorous, consisting entirely of live animal prey. They primarily consume insects such as moths and crickets but also hunt small vertebrates like frogs and lizards. Their night-time hunting is punctuated by bursts of movement and quiet observation as they stalk their prey through the understorey.

Mating and Reproduction

Although detailed reproductive data are scarce for this species, Gursky’s spectral tarsiers likely follow similar breeding patterns to other tarsiers. They are known to breed throughout the year, producing one offspring at a time after a gestation period of about six months. The young are born furred and open-eyed, clinging to their parent as they learn to navigate the trees.

FAQs

How many Gursky’s spectral tarsiers are left in the wild?

Precise population numbers of these tarsiers are not known, but density estimates suggest that in pristine habitats, up to 156 individuals per km² may exist (Gursky, 1997). However, in heavily degraded areas, this number can plummet to as low as 45 individuals per km² (Merker, 2003). Their fragmented range and habitat loss make accurate counts difficult, but population declines are expected to continue if deforestation is not halted.

What is their lifespan in the wild?

While specific data for Tarsius spectrumgurskyae is not available, other tarsier species can live between 8–12 years in the wild. In captivity, where threats like predation are removed, their lifespan may be slightly longer. However, these animals do not thrive in captivity and should never be kept as pets.

What challenges do they face in conservation?

One major challenge is habitat degradation due to logging, agriculture, and the spread of palm oil plantations. Though they can tolerate some disturbance, their population density drops significantly with increasing habitat destruction. Additionally, their small size and elusive nature make them difficult to monitor, and they are sometimes misidentified as other tarsier species, complicating conservation strategies.

Do Gursky’s spectral tarsiers make good pets?

No. These sensitive and social primates should never be kept as pets. Capturing them from the wild is cruel and contributes directly to population collapse. It destroys their family groups, causes immense suffering, and feeds into illegal wildlife trade networks. If you care about their survival, never buy a wild animal and advocate against exotic pet ownership.

Take Action!

The future of the Gursky’s spectral tarsier hangs by a thread. Forests are falling at an alarming rate, replaced with monocultures and poisoned with pesticides. Speak up. Refuse to fund deforestation-driven industries. Boycott palm oil. Protect what’s left of Sulawesi’s dwindling forests and support indigenous-led conservation efforts. Never buy wildlife as pets. #BoycottPalmOil #Boycott4Wildlife #Vegan #BoycottMeat

Support Gursky’s Tarsiers by going vegan and boycotting palm oil in the supermarket, it’s the #Boycott4Wildlife

Support the conservation of this species

This animal has no protections in place. Read about other forgotten species here. Create art to support this forgotten animal or raise awareness about them by sharing this post and using the #Boycottpalmoil #Boycott4Wildlife hashtags on social media. Also you can boycott palm oil in the supermarket.

Further Information

Shekelle, M., Groves, C. P., Maryanto, I., & Mittermeier, R. A. (2017). Two new tarsier species (Tarsiidae, Primates) and the biogeography of Sulawesi, Indonesia. Primate Conservation, 31, 37–56. https://researchportalplus.anu.edu.au/en/publications/two-new-tarsier-species-tarsiidae-primates-and-the-biogeography-o

Shekelle, M. 2020. Tarsius spectrumgurskyae. The IUCN Red List of Threatened Species 2020: e.T162336422A162336580. https://dx.doi.org/10.2305/IUCN.UK.2020-3.RLTS.T162336422A162336580.en. Accessed on 06 April 2025.

Wikipedia. (n.d.). Gursky’s spectral tarsier. Retrieved April 6, 2025, from https://en.wikipedia.org/wiki/Gursky%27s_spectral_tarsier

How can I help the #Boycott4Wildlife?

Take Action in Five Ways

1. Join the #Boycott4Wildlife on social media and subscribe to stay in the loop: Share posts from this website to your own network on Twitter, Mastadon, Instagram, Facebook and Youtube using the hashtags #Boycottpalmoil #Boycott4Wildlife.

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2. Contribute stories: Academics, conservationists, scientists, indigenous rights advocates and animal rights advocates working to expose the corruption of the palm oil industry or to save animals can contribute stories to the website.

Wildlife Artist Juanchi Pérez

Mel Lumby: Dedicated Devotee to Borneo’s Living Beings

Anthropologist and Author Dr Sophie Chao

Health Physician Dr Evan Allen

The World’s Most Loved Cup: A Social, Ethical & Environmental History of Coffee by Aviary Doert

How do we stop the world’s ecosystems from going into a death spiral? A #SteadyState Economy

3. Supermarket sleuthing: Next time you’re in the supermarket, take photos of products containing palm oil. Share these to social media along with the hashtags to call out the greenwashing and ecocide of the brands who use palm oil. You can also take photos of palm oil free products and congratulate brands when they go palm oil free.

https://twitter.com/CuriousApe4/status/1526136783557529600?s=20

https://twitter.com/PhillDixon1/status/1749010345555788144?s=20

https://twitter.com/mugabe139/status/1678027567977078784?s=20

4. Take to the streets: Get in touch with Palm Oil Detectives to find out more.

5. Donate: Make a one-off or monthly donation to Palm Oil Detectives as a way of saying thank you and to help pay for ongoing running costs of the website and social media campaigns. Donate here

Learn about other animals endangered by palm oil and other agriculture

Gursky’s Spectral Tarsier Tarsius spectrumgurskyae

Sunda Flying Lemur Galeopterus variegatus

Western Parotia Parotia sefilata

Capped Langur Trachypithecus pileatus

Mountain Tapir Tapirus pinchaque

Saola Pseudoryx nghetinhensis

Learn about “sustainable” palm oil greenwashing

Read more about RSPO greenwashing

A 2019 World Health Organisation (WHO) report into the palm oil industry and RSPO finds extensive greenwashing of palm oil deforestation and the murder of endangered animals (i.e. biodiversity loss)

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Sunda Flying Lemur Galeopterus variegatus

Sunda Flying Lemur Galeopterus variegatus

Locations: Thailand, Cambodia, Vietnam, Laos, Myanmar, Peninsular Malaysia, Singapore, Brunei, Indonesia (Java, Sumatra, Kalimantan, Bali), and Borneo

The Sunda flying lemur, also known as the Malayan flying lemur or Malayan #colugo, silently glides through the tropical forests of Southeast Asia, relying on ancient forests to survive. Despite their name, they are not true lemurs, nor do they fly—they are gliders, and among the most skilful in the world. This species is experiencing population declines in several parts of their range. They are threatened by #deforestation from #timber, #palmoil plantations, and #hunting by local communities. Forest loss, particularly in #Java, #Vietnam, and #Thailand, is fragmenting their populations and endangering their survival. Use your wallet as a weapon every time you shop and protect these sensitive creatures #BoycottPalmOil #Boycott4Wildlife

https://youtu.be/NUukaAK4YSI

The elegant #Sunda flying #lemur AKA #Colugo can glide 100m through trees 🪽🕊️ in #Sumatra #Kalimantan and #Borneo. Totally reliant on trees, #palmoil is a major threat to them 😿 Fight back and🌴🩸🔥☠️🧐🚫 #Boycottpalmoil #Boycott4Wildlife @palmoildetect https://palmoildetectives.com/2026/02/08/sunda-flying-lemur-galeopterus-variegatus/

Hauntingly beautiful gliding #mammal, the Malayan #Colugo/ Sunda Flying #Lemur uses a cape-like skin membrane to slide 100’s of metres through the #rainforests of SE #Asia. Fight for them and #Boycottpalmoil 🌴🙊🤮🚜🔥❌ #Boycott4Wildlife @palmoildetect https://palmoildetectives.com/2026/02/08/sunda-flying-lemur-galeopterus-variegatus/

Appearance & Behaviour

Sunda flying lemurs are hauntingly beautiful gliding mammals, with their large, forward-facing eyes adapted for night vision and a delicate, kite-shaped membrane of skin called a patagium stretching from their neck to their fingertips, tail, and toes. This structure allows them to glide over 100 metres through the forest canopy, losing as little as 10 metres in elevation. On the ground, they are nearly helpless, but in the trees, they move with astonishing agility. These quiet, nocturnal mammals spend their days curled up in tree hollows or nestled in the dense fronds of coconut trees, becoming active at dusk when they begin foraging.

Threats

Palm oil deforestation

The widespread clearing of tropical rainforest to establish palm oil plantations is one of the greatest threats to the Sunda flying lemur. These gliders rely heavily on continuous tree canopy for movement, foraging, and breeding. When forests are fragmented or entirely removed for palm oil, flying lemurs become stranded, exposed to predators, and unable to access food or shelter. This process has caused severe habitat degradation across Peninsular Malaysia, Sumatra, and Borneo.

Human persecution and hunting

In Java and some other regions, Sunda flying lemurs are hunted by local communities, including the Baduy Tribe, who increase hunting activity every four years as part of cultural practices. Though the species yields little meat, they are still killed for consumption or perceived nuisance. Hunting disrupts already fragile populations, particularly in areas where habitat loss has already reduced numbers and isolated groups.

Logging and forest fragmentation for timber

Commercial and illegal logging contribute to the rapid degradation of forests across Southeast Asia. Even selective logging can cause fragmentation, which limits the flying lemur’s ability to glide and forces them to descend to the ground—where they are highly vulnerable to predators and human threats. Logging roads also increase human access to remote forests, further accelerating hunting and forest conversion.

Competition with invasive species

In degraded habitats and plantations, Sunda flying lemurs face increased competition for food and nesting sites from invasive and generalist species such as the Plantain Squirrel (Callosciurus notatus). These squirrels are more adaptable and can dominate food sources, leaving less for the more specialised colugo. Competition like this puts additional stress on the already fragile populations of flying lemurs, especially in fragmented or edge habitats.

Urban expansion and infrastructure development

Rapid urbanisation across Southeast Asia has resulted in the encroachment of cities and towns into previously forested areas. Roads, buildings, hydroelectric dams and agricultural expansion sever vital canopy corridors and isolate populations, making gliding impossible in many urban landscapes. As a result, Sunda flying lemurs are forced to navigate unsuitable environments, increasing their risk of vehicle collisions, electrocution from power lines, and conflict with humans.

Weak protections and lack of enforcement

Although the Sunda flying lemur is legally protected in several countries, enforcement is often weak or inconsistent. In areas like Sarawak and Java, data on current populations is outdated or incomplete, making it difficult to assess trends or plan effective conservation strategies. Without strong protections and ongoing monitoring, habitat loss and hunting will continue to drive the species toward future vulnerability or extinction.

Geographic Range

Sunda flying lemurs are found across Southeast Asia, including Thailand, Cambodia, Vietnam, Laos, southern Myanmar, Peninsular Malaysia, Singapore, Brunei, and Indonesia (Java, Bali, Sumatra, Kalimantan, and Borneo). They are patchily distributed, with population declines noted in Java and possibly Sarawak. They occur in both primary and secondary forests, and are sometimes seen in plantations and gardens—but dense forest canopy is critical for their survival. Populations in disturbed habitats are less viable due to limited gliding space and reduced food availability.

Diet

The Sunda flying lemur feeds primarily on young leaves, buds, shoots, flowers, and fruits of a wide variety of forest trees. In Bako National Park, Sarawak, they have been observed feeding on over 12 tree species, with Buchanania arborescens making up over 50% of their diet. They also consume tree sap and have even been seen licking bark for water and minerals. Interestingly, they have been recorded feeding on ants (Paratrechina longicornis) in rare cases, highlighting their adaptability in changing environments.

Mating and Reproduction

After a gestation period of about 60 days, females give birth to a single young, which clings to the mother’s belly and is cradled within the folds of the patagium. The mother’s gliding membrane acts like a living pouch, offering warmth and protection as she climbs and glides through the treetops. Not much else is known about their mating systems or breeding intervals, but juveniles stay with their mothers until they are old enough to glide on their own.

FAQs

How many Sunda flying lemurs are left in the wild?

Exact population numbers are unknown, but the species is believed to be in slow decline. Localised extinctions are suspected in parts of Java and mainland Southeast Asia due to hunting and habitat fragmentation. While still widespread, their dependence on intact forests makes them vulnerable to ongoing deforestation (Boeadi & Steinmetz, 2008).

How long do Sunda flying lemurs live?

In the wild, their lifespan is estimated to be around 10–15 years, though this can vary depending on threats and environmental conditions. Data from wild populations are limited due to their elusive, nocturnal habits (Wikipedia, n.d.).

Why are they threatened by palm oil?

Palm oil plantations destroy the lowland tropical forests that flying lemurs depend on. Unlike other adaptable mammals, colugos require dense canopy cover for safe gliding, resting, and breeding. When forests are cleared, these gliders lose their ability to navigate safely, exposing them to predators and starvation. The conversion of rainforest into monoculture plantations has led to significant declines in habitat quality across their range (Lim et al., 2013; Nasir & Abdullah, 2009).

Do Sunda flying lemurs make good pets?

Absolutely not. Sunda flying lemurs are wild animals with specialised needs. They are not domesticated, and keeping them as pets leads to extreme stress, injury, or death. Capturing these animals for trade disrupts family groups and contributes to their extinction. If you care about flying lemurs, advocate against the exotic pet trade and never support it.

What conservation efforts are underway?

National laws protect the Sunda flying lemur in many range countries, and studies have been conducted in places like Bako National Park and Singapore. However, much stronger protection is needed, particularly in habitat protection and indigenous-led conservation. Conservationists recommend protecting forest patches, especially those with >95% canopy cover, to ensure their survival (Lim et al., 2013).

Take Action!

Protect the Sunda flying lemur by choosing only products that are 100% palm oil-free. Avoiding palm oil directly combats deforestation and preserves vital canopy corridors these animals depend on. Support indigenous-led agroecology and forest protection movements. Never support the exotic pet trade or keep wild animals in captivity. Every purchase you make has the power to either destroy or safeguard their rainforest homes. #BoycottPalmOil #Boycott4Wildlife

Support Sunda Flying Lemurs by going vegan and boycotting palm oil in the supermarket, it’s the #Boycott4Wildlife

Support the conservation of this species

This animal has no protections in place. Read about other forgotten species here. Create art to support this forgotten animal or raise awareness about them by sharing this post and using the #Boycottpalmoil #Boycott4Wildlife hashtags on social media. Also you can boycott palm oil in the supermarket.

Further Information

Boeadi & Steinmetz, R. 2008. Galeopterus variegatus. The IUCN Red List of Threatened Species 2008: e.T41502A10479343. https://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T41502A10479343.en. Accessed on 06 April 2025.

Lim, N. T-L., Giam, X., Byrnes, G., & Clements, G. R. (2013). Occurrence of the Sunda colugo (Galeopterus variegatus) in the tropical forests of Singapore: A Bayesian approach. Mammalian Biology, 78(1), 63–67. https://doi.org/10.1016/j.mambio.2012.06.008

Nasir, D., & Abdullah, M. T. (2009). Foraging ecology of the Sunda colugo (Galeopterus variegatus) in Bako National Park, Sarawak, Malaysia. Malayan Nature Journal, 61(4), 285–294. https://www.researchgate.net/publication/290610443_Foraging_ecology_of_the_sunda_colugo_galeopterus_variegatus_in_bako_national_park_sarawak_malaysia

Wikipedia. (n.d.). Sunda flying lemur. Retrieved April 6, 2025, from https://en.wikipedia.org/wiki/Sunda_flying_lemur

How can I help the #Boycott4Wildlife?

Take Action in Five Ways

1. Join the #Boycott4Wildlife on social media and subscribe to stay in the loop: Share posts from this website to your own network on Twitter, Mastadon, Instagram, Facebook and Youtube using the hashtags #Boycottpalmoil #Boycott4Wildlife.

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2. Contribute stories: Academics, conservationists, scientists, indigenous rights advocates and animal rights advocates working to expose the corruption of the palm oil industry or to save animals can contribute stories to the website.

Wildlife Artist Juanchi Pérez

Mel Lumby: Dedicated Devotee to Borneo’s Living Beings

Anthropologist and Author Dr Sophie Chao

Health Physician Dr Evan Allen

The World’s Most Loved Cup: A Social, Ethical & Environmental History of Coffee by Aviary Doert

How do we stop the world’s ecosystems from going into a death spiral? A #SteadyState Economy

3. Supermarket sleuthing: Next time you’re in the supermarket, take photos of products containing palm oil. Share these to social media along with the hashtags to call out the greenwashing and ecocide of the brands who use palm oil. You can also take photos of palm oil free products and congratulate brands when they go palm oil free.

https://twitter.com/CuriousApe4/status/1526136783557529600?s=20

https://twitter.com/PhillDixon1/status/1749010345555788144?s=20

https://twitter.com/mugabe139/status/1678027567977078784?s=20

4. Take to the streets: Get in touch with Palm Oil Detectives to find out more.

5. Donate: Make a one-off or monthly donation to Palm Oil Detectives as a way of saying thank you and to help pay for ongoing running costs of the website and social media campaigns. Donate here

Learn about other animals endangered by palm oil and other agriculture

Sunda Flying Lemur Galeopterus variegatus

Western Parotia Parotia sefilata

Capped Langur Trachypithecus pileatus

Mountain Tapir Tapirus pinchaque

Saola Pseudoryx nghetinhensis

Tucuxi Sotalia fluviatilis

Learn about “sustainable” palm oil greenwashing

Read more about RSPO greenwashing

A 2019 World Health Organisation (WHO) report into the palm oil industry and RSPO finds extensive greenwashing of palm oil deforestation and the murder of endangered animals (i.e. biodiversity loss)