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North Bornean Gray Gibbon
Hylobates funereus
Silhouette: Kai R. Caspar · PhyloPic
- KingdomAnimalia (Animals)
- PhylumChordata (Chordates)
- ClassMammalia (Mammals)
- OrderPrimates
- FamilyHylobatidae (Gibbons)
- GenusHylobates (Dwarf Gibbons)
- SpeciesHylobates funereus (North Bornean Gray Gibbon)
In 3 days ~60% in a week ~90%
114 Verified sightings at Sepilok From 2019 to 2026
226 In all 3 parks
November Best month
🌙 Nocturnal When it's spotted
About the North Bornean Gray Gibbon
The eastern grey gibbon or northern grey gibbon (Hylobates funereus) is a primate in the gibbon family, Hylobatidae. Formerly, the eastern grey gibbon and western grey gibbon (H. abbotti) were considered conspecific with the southern grey gibbon (H. muelleri), but more recent studies indicate that all three are distinct species, and both the IUCN Red List and the American Society of Mammalogists consider them such. However, they can still hybridize with one another where their ranges meet.
It is endemic to northeastern Borneo, and is found in Kalimantan, Sarawak, and Brunei. It ranges from Sabah south to the Mahakam River in East Kalimantan, and west to Baram in Sarawak. As with the other two grey gibbons, this species is thought to be endangered due to heavy deforestation in Borneo, as well as increases in forest fires exacerbated by El Niño events. It is also threatened by illegal hunting and capture for the pet trade. Wikipedia →
Recent sightings of North Bornean Gray Gibbon in Sepilok
LIVEiNaturalistGlobal Distribution
Parks Where Found
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Danum Valley Conservation Area | 🇲🇾 Malaysia | |
| 2 | Sepilok | 🇲🇾 Malaysia | |
| 3 | Kinabatangan Wildlife Sanctuary | 🇲🇾 Malaysia |
Closest Relatives at Sepilok
Before you go
What are the chances of seeing a North Bornean Gray Gibbon in Sepilok?
Possible
About 30% of wildlife watchers report a North Bornean Gray Gibbon sighting in Sepilok on a given day, based on 114 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 13th most-seen of the 23 mammals we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
When is the best time to see a North Bornean Gray Gibbon in Sepilok?
November
In that month about 40% of wildlife watchers report a North Bornean Gray Gibbon in Sepilok on a given day, against under 5% in May, the lowest month. That is one of Sepilok's wettest months, with about 400 mm of rain against 170 mm in March.
What time of day is best to see a North Bornean Gray Gibbon?
Between 1 and 4 am
Across all the parks we cover, that three-hour window holds the most North Bornean Gray Gibbon sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Is Sepilok the best place to see a North Bornean Gray Gibbon?
2nd of 3
Of the 3 parks where we can rate North Bornean Gray Gibbon sightings, Sepilok ranks 2nd at about 30%. The best odds are in Danum Valley Conservation Area (Malaysia, about 40%).
Which relatives of the North Bornean Gray Gibbon live in Sepilok?
Same order: Primates
The closest relatives of the North Bornean Gray Gibbon that you can see in Sepilok (order Primates) are Bornean Orangutan (about 50%), Southern Pig-tailed Macaque (about 40%) and Proboscis Monkey (about 40%), with each one's daily chance of a sighting.
Where does the North Bornean Gray Gibbon sighting chance come from?
GBIF citizen-science records
It is estimated from how often the North Bornean Gray Gibbon is recorded against all the mammals logged in Sepilok (114 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
