Siamang
SiamangSiamangSiamangSiamang

Siamang

Symphalangus syndactylus

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
40–50% · Likely
overall probability at Way Kambas National Park
9 Verified records at Way Kambas National Park
September Best month highest sighting rate
🌅 Crepuscular When it's active at dawn and dusk

The siamang (, also UK: ; Symphalangus syndactylus) is an endangered arboreal, black-furred gibbon native to the tropical rainforests of Indonesia, Malaysia, and Thailand. The largest of the gibbons, the siamang can be twice the size of other gibbons, reaching 1 m (3.3 ft) in height, and weighing up to 14 kg (31 lb). It is the only species in the genus Symphalangus. Fossils of siamangs date back to the Middle Pleistocene. Two features distinguish the siamang from other gibbons. First, two digits on each foot—the second and third toes—are partially joined by a membrane, hence the specific name syndactylus, from the Ancient Greek σύν, sun-, "with" + δάκτυλος, daktulos, "finger". Wikipedia →

40–50% of wildlife watchers report a Siamang sighting in Way Kambas National Park, based on 9 days of visitor records from GBIF citizen-science data.

Closest Relatives at Way Kambas National Park

Crab-eating Macaque
EN Endemic

Crab-eating Macaque

🌅 Crepuscular Mammal

Macaca fascicularis

50–60% · Likely
Sunda Slow Loris
EN

Sunda Slow Loris

☀️ Diurnal Mammal

Nycticebus coucang

40–50% · Likely
Silvered Leaf Monkey
VU

Silvered Leaf Monkey

🌅 Crepuscular Mammal

Trachypithecus cristatus

Insufficient data
Horsfield's Tarsier
VU

Horsfield's Tarsier

☀️ Diurnal Mammal

Cephalopachus bancanus

Insufficient data
Southern Pig-tailed Macaque
EN

Southern Pig-tailed Macaque

🌅 Crepuscular Mammal

Macaca nemestrina

Insufficient data
Southern Mitered Langur
VU

Southern Mitered Langur

🌅 Crepuscular Mammal

Presbytis mitrata

Insufficient data

📅 Monthly Probability

20–30
Jan
10–20
Feb
20–30
Mar
50–60
Apr
50–60
May
20–30
Jun
50–60
Jul
20–30
Aug
60–70
Sep
20–30
Oct
40–50
Nov
20–30
Dec

🌅 When They're Spotted

Most active at dawn and dusk · across all parks (global)

🌅Crepuscular
☀️🌙🌙12am6am12pm6pm12am

Global Distribution

Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.

where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is)  ·  parks where it occurs — tap a pin for the sighting probability there

Parks Where Found

# Park Country Probability
1 Way Kambas National Park 🇮🇩 Indonesia
40–50%
2 Kerinci Seblat National Park 🇮🇩 Indonesia
40–50%

Quick answers

What are the chances of seeing a Siamang in Way Kambas National Park?

About 44% of wildlife watchers report a Siamang sighting in Way Kambas National Park, based on 9 days of visitor records from GBIF citizen-science data.

When is the best time to see Siamang in Way Kambas National Park?

September has the highest sighting rate for Siamang in Way Kambas National Park in our monthly data.

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