Trachypithecus cristatus
Silhouette: Andy Wilson · PhyloPic
In 3 days ~70% in a week ~90%
The silvery lutung (Trachypithecus cristatus), also known as the silvered leaf monkey or the silvery langur, is an Old World monkey. It is arboreal, living in coastal, mangrove, and riverine forests in Sumatra, Borneo, Java, as well as in parts of the southwestern Malay Peninsula, the Natuna Islands, and other nearby islands. It is the type species of its species group.
The silvery lutung is a medium-sized monkey with a long, non-prehensile tail. It has grey-tipped, dark brown or black fur, giving it a uniform silvery appearance. Unlike some related species, there are no paler markings on the face or body, except for a patch of whitish hair on the groin of females. A crest of fur runs along the top of the head, and the hair on the cheeks is long, often obscuring the ears. The hands and feet are hairless, with dark-coloured skin, and have opposable thumbs and toes.
Females range from 46 to 51 centimetres (18 to 20 in) in head-body length, with an average weight of 5.7 kilograms (13 lb) and a tail length of 67 to 75 centimetres (26 to 30 in). Males are slightly larger, from 50 to 58 centimetres (20 to 23 in) in length, with an average weight of 6.6 kilograms (15 lb... Wikipedia →
Recording0:19
Malaysia · 2026
© Dixon Lau · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bako National Park | 🇲🇾 Malaysia | |
| 2 | Kinabatangan Wildlife Sanctuary | 🇲🇾 Malaysia | |
| 3 | Tanjung Puting National Park | 🇮🇩 Indonesia | |
| 4 | Gunung Leuser National Park | 🇮🇩 Indonesia | |
| 5 | Sepilok | 🇲🇾 Malaysia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | San Diego Zoo | 🇺🇸 United States | |
| 2 | Columbus Zoo and Aquarium | 🇺🇸 United States | |
| 3 | Bronx Zoo | 🇺🇸 United States | |
| 4 | Zoo Knoxville | 🇺🇸 United States | |
| 5 | Saigon Zoo and Botanical Gardens | 🇻🇳 Vietnam | |
| 6 | Bandung Zoo | 🇮🇩 Indonesia | |
| 7 | Kung Fu Corals | 🇺🇸 United States |
Possible
About 30% of wildlife watchers report a Silvered Leaf Monkey sighting in Gunung Leuser National Park on a given day, based on 40 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 6th most-seen of the 19 mammals we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
September
In that month about 60% of wildlife watchers report a Silvered Leaf Monkey in Gunung Leuser National Park on a given day, against under 5% in August, the lowest month. That is one of Gunung Leuser National Park's wettest months, with about 700 mm of rain against 150 mm in February.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Silvered Leaf Monkey sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
4th of 5
Of the 5 parks where we can rate Silvered Leaf Monkey sightings, Gunung Leuser National Park ranks 4th at about 30%. The best odds are in Bako National Park (Malaysia, about 80%), Kinabatangan Wildlife Sanctuary (Malaysia, about 60%) and Tanjung Puting National Park (Indonesia, about 40%). All parks ranked.
Same family: Cercopithecidae
The closest relatives of the Silvered Leaf Monkey that you can see in Gunung Leuser National Park (family Cercopithecidae, Old World Monkeys) are Thomas’s Langur (about 80%), Crab-eating Macaque (about 70%) and Southern Pig-tailed Macaque (about 60%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Silvered Leaf Monkey is recorded against all the mammals logged in Gunung Leuser National Park (40 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.
