Nycticebus coucang
Silhouette: Mareike C. Janiak · PhyloPic
In 3 days ~80% in a week >90%
The Sunda slow loris (Nycticebus coucang), or greater slow loris, is a strepsirrhine primate and a species of slow loris native to Indonesia, West Malaysia, southern Thailand and Singapore. It measures 27 to 38 cm (11 to 15 in) from head to tail and weighs between 599 and 685 g (21.1 and 24.2 oz). Like other slow lorises, it has a wet nose (rhinarium), a round head, small ears hidden in thick fur, a flat face, large eyes and a vestigial tail.
The Sunda slow loris is nocturnal and arboreal, typically occurring in evergreen forests. It prefers rainforests with continuous dense canopies and has an extremely low metabolic rate compared to other mammals of its size. Its diet consists of sap, floral nectar, fruit and arthropods, and will feed on exudates such as gum and sap by licking wounds in trees. Individuals are generally solitary, with one study showing only 8% of its active time was spent near other individuals. It has a monogamous mating system with the offspring living with the parents. It sleeps during the day, rolled up in a ball in hidden parts of trees above the ground, often on branches, twigs, palm fronds, or lianas. The species is polyoestrous, usually giving birth to a single offspring after a gestation period of 192 days. The young disperses between 16 and 27 months, generally when it is sexually mature.
The species is listed as endangered on the IUCN Red List. It is threatened with extinction due to a growing demand in the exotic pet trade, and has become one of the most abundant primate species on sale at Indonesian pet markets. Its teeth are often pulled out before being sold as pets which can result in infection and/or death. Lack of teeth makes reintroduction to the wild impossible. It also suffers from habitat loss, which has been severe in the areas in which it is found. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Way Kambas National Park | 🇮🇩 Indonesia | |
| 2 | Taman Negara National Park | 🇲🇾 Malaysia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Gembira Loka Zoo | 🇮🇩 Indonesia | |
| 2 | Cambridge Butterfly Conservatory | 🇨🇦 Canada | |
| 3 | Farm in the City | 🇲🇾 Malaysia |
Likely
About 50% of wildlife watchers report a Sunda Slow Loris sighting in Way Kambas National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 3rd most-seen of the 9 mammals we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
April
In that month about 70% of wildlife watchers report a Sunda Slow Loris in Way Kambas National Park on a given day, against about 10% in February and October, the lowest months.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Sunda Slow Loris sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Yes
Of the 2 parks where we can rate Sunda Slow Loris sightings, Way Kambas National Park has the highest daily chance: about 50%. Next come Taman Negara National Park (Malaysia, about 20%).
Same order: Primates
The closest relatives of the Sunda Slow Loris that you can see in Way Kambas National Park (order Primates) are Crab-eating Macaque (about 60%) and Siamang (about 50%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sunda Slow Loris is recorded against all the mammals logged in Way Kambas National Park (10 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.
