Gunung Leuser National Park
🇮🇩 Indonesia
🦧 Wild Sumatran Orangutans Roam FreelyGunung Leuser National Park is a vast tropical rainforest reserve on the island of Sumatra in Indonesia. Its dense canopy, steep jungle ridges, and muddy footpaths create a challenging environment for walking, yet this thick vegetation supports an extraordinary density of tree-dwelling wildlife. The park is especially famous for sheltering the Sumatran Orangutan, alongside energetic troops of Thomas’s Langur and social groups of Crab-eating Macaque that frequently forage near the forest edges during daylight hours.
3.305° N 97.661° E
Wildlife
⭐ Iconic Species
★ Sumatran Orangutan
Pongo abelii
★ Thomas’s Langur
Presbytis thomasi
★ Crab-eating Macaque
Macaca fascicularis
★ Rhinoceros Hornbill
Buceros rhinoceros
📊 Most Spotted
Wagler's Pit Viper
Tropidolaemus wagleri
Southern Pig-tailed Macaque
Macaca nemestrina
Yellow-vented Bulbul
Pycnonotus goiavier
Common Water Monitor
Varanus salvator
Lar Gibbon
Hylobates lar
Black-eared Barbet
Psilopogon duvaucelii
Many-lined Sun-skink
Eutropis multifasciata
River Toad
Phrynoidis asper
Oriental Garden Lizard
Calotes versicolor
Blue-crowned Hanging-Parrot
Loriculus galgulus
Common Bronze-back
Dendrelaphis pictus
Silvered Leaf Monkey
Trachypithecus cristatus
⭐ Iconic Species
★ Sumatran Orangutan
Pongo abelii
★ Thomas’s Langur
Presbytis thomasi
★ Crab-eating Macaque
Macaca fascicularis
📊 Most Spotted
Southern Pig-tailed Macaque
Macaca nemestrina
Lar Gibbon
Hylobates lar
Silvered Leaf Monkey
Trachypithecus cristatus
Siamang
Symphalangus syndactylus
Diadem Roundleaf Bat
Hipposideros diadema
Plantain Squirrel
Callosciurus notatus
Prevost's Squirrel
Callosciurus prevostii
Black Giant Squirrel
Ratufa bicolor
Black Sumatran Langur
Presbytis sumatrana
Sumatra Slow Loris
Nycticebus hilleri
Sun Bear
Helarctos malayanus
lesser sheath-tailed bat
Emballonura monticola
⭐ Iconic Species
📊 Most Spotted
Yellow-vented Bulbul
Pycnonotus goiavier
Black-eared Barbet
Psilopogon duvaucelii
Blue-crowned Hanging-Parrot
Loriculus galgulus
Gray-rumped Treeswift
Hemiprocne longipennis
Red-eyed Bulbul
Pycnonotus brunneus
Sooty-headed Bulbul
Pycnonotus aurigaster
Dark-necked Tailorbird
Orthotomus atrogularis
Ashy Tailorbird
Orthotomus ruficeps
Zebra Dove
Geopelia striata
Spectacled Bulbul
Rubigula erythropthalmos
Brown-throated Sunbird
Anthreptes malacensis
Common Iora
Aegithina tiphia
📊 Most Spotted
Wagler's Pit Viper
Tropidolaemus wagleri
Common Water Monitor
Varanus salvator
Many-lined Sun-skink
Eutropis multifasciata
Oriental Garden Lizard
Calotes versicolor
Common Bronze-back
Dendrelaphis pictus
Flat-tailed House Gecko
Hemidactylus platyurus
Malayan Soft-shelled Turtle
Dogania subplana
Green Crested Lizard
Bronchocela cristatella
Spiny Terrapin
Heosemys spinosa
Malayan Crested Lizard
Gonocephalus grandis
Spotted House Gecko
Gekko monarchus
Large Forest Gecko
Gekko smithii
📊 Most Spotted
River Toad
Phrynoidis asper
Common Tree Frog
Polypedates leucomystax
Poisonous Rock Frog
Odorrana hosii
Common Indian Toad
Duttaphrynus melanostictus
North Sumatra White-lipped Frog
Chalcorana parvaccola
Horned Toad
Megophrys nasuta
Alpine Cricket Frog
Fejervarya limnocharis
Green Paddy Frog
Hylarana erythraea
Kerinci Cascade Frog
Sumaterana crassiovis
Blyth's River Frog
Limnonectes blythii
Peter's Tree Frog
Nyctixalus pictus
Sumatra Huia Frog
Huia sumatrana
Animal Events
2Gibbon Territorial Song Peaks
Lar Gibbons amplify their melodic morning calls to defend territory boundaries as seasonal resource competition shifts across the rainforest canopy.
3Hornbill Breeding and Nesting Season
Large hornbill species begin their unique cavity-sealing nesting behaviors, becoming prominent targets for birdwatchers across mature lowland trees.
1Primate Mating and Fruit Abundance
The peak fruiting season triggers heightened social interaction, vocalizations, and breeding activity among canopy dwellers like the Southern Pig-tailed Macaque and Siamang.
Sighting Calendar
Average chance of spotting the park's most-spotted species, month by month
- 1Primate Mating and Fruit Abundance
- 2Gibbon Territorial Song Peaks
- 3Hornbill Breeding and Nesting Season
Sighting Zones
Warm areas are where all species together are recorded most, so they track where people go as much as where animals are. For one species, see the map on its own page.
Where Wildlife Score
How good is this park for seeing wildlife?Biodiversity
ExcellentHow rich is the wildlife?
Sighting
GoodHow likely to see animals?
Quick answers
What animals can you see in Gunung Leuser National Park?
The most likely sightings are Sumatran Orangutan (seen by about 80% of wildlife watchers), Thomas’s Langur (seen by about 80% of wildlife watchers), Crab-eating Macaque (seen by about 70% of wildlife watchers), Wagler's Pit Viper (seen by about 70% of wildlife watchers), Southern Pig-tailed Macaque (seen by about 60% of wildlife watchers) — among 1160 recorded vertebrate species, based on citizen-science data from GBIF.
When is the best time to visit Gunung Leuser National Park for wildlife?
May has the highest combined sighting rate for the park's top species in our month-by-month GBIF data. The full sighting calendar on this page shows each species' best months.
Can you see Sumatran Orangutan in Gunung Leuser National Park?
Yes — about 80% of wildlife watchers report a Sumatran Orangutan sighting in Gunung Leuser National Park, based on 354 verified sightings from GBIF citizen-science data.
Can you see Thomas’s Langur in Gunung Leuser National Park?
Yes — about 80% of wildlife watchers report a Thomas’s Langur sighting in Gunung Leuser National Park, based on 263 verified sightings from GBIF citizen-science data.
Can you see Crab-eating Macaque in Gunung Leuser National Park?
Yes — about 70% of wildlife watchers report a Crab-eating Macaque sighting in Gunung Leuser National Park, based on 174 verified sightings from GBIF citizen-science data.
Can you see Rhinoceros Hornbill in Gunung Leuser National Park?
Yes — about 40% of wildlife watchers report a Rhinoceros Hornbill sighting in Gunung Leuser National Park, based on 158 verified sightings from GBIF citizen-science data.
