The checklist: 3 animals

Sumatran Orangutan
CR

Sumatran Orangutan

☀️ Diurnal Mammal

Pongo abelii

Daily sighting probability ~80% · Very likely
Siamang
EN

Siamang

🌅 Crepuscular Mammal

Symphalangus syndactylus

Daily sighting probability ~50% · Likely
Lar Gibbon
EN

Lar Gibbon

☀️ Diurnal Mammal

Hylobates lar

Daily sighting probability ~70% · Very likely

Where to go

Chance of seeing in

Month by month at Gunung Leuser National Park

~60%
Jan
~60%
Feb
~40%
Mar
~40%
Apr
~60%
May
~60%
Jun
~40%
Jul
<5%
Aug
~70%
Sep
~40%
Oct
~50%
Nov
~40%
Dec

Time of day

midnight6amnoon6pmmidnight

Parks

#ParkCountryAnimalsAll 3 in 3 days
1 Gunung Leuser National Park 🇮🇩 Indonesia
3 of 3
~60%
2 Khao Yai National Park 🇹🇭 Thailand
1 of 3
Missing: Sumatran orangutan, Siamang
3 Kerinci Seblat National Park 🇮🇩 Indonesia
1 of 3
Missing: Sumatran orangutan, Lar gibbon
4 Kaeng Krachan National Park 🇹🇭 Thailand
1 of 3
Missing: Sumatran orangutan, Siamang
5 Way Kambas National Park 🇮🇩 Indonesia
1 of 3
Missing: Sumatran orangutan, Lar gibbon
6 Taman Negara National Park 🇲🇾 Malaysia
1 of 3
Missing: Sumatran orangutan, Siamang
7 Khao Sok National Park 🇹🇭 Thailand
1 of 3
Missing: Sumatran orangutan, Siamang

Zoos & centres

# Zoo / Centre Country
1 Lisbon Oceanarium 🇵🇹 Portugal 3 of 3 in captivity
2 Columbus Zoo and Aquarium 🇺🇸 United States 3 of 3 in captivity
3 Gembira Loka Zoo 🇮🇩 Indonesia 3 of 3 in captivity
4 Johor Zoo 🇲🇾 Malaysia 3 of 3 in captivity
5 Leofoo Village Theme Park 🇹🇼 Taiwan 3 of 3 in captivity
6 National Zoo of Malaysia 🇲🇾 Malaysia 3 of 3 in captivity
7 San Diego Zoo 🇺🇸 United States 2 of 3 in captivity
8 Pairi Daiza 🇧🇪 Belgium 2 of 3 in captivity
9 Denver Zoo 🇺🇸 United States 2 of 3 in captivity
10 Cincinnati Zoo and Botanical Garden 🇺🇸 United States 2 of 3 in captivity
11 Fota Wildlife Park 🇮🇪 Ireland 2 of 3 in captivity
12 Zoologic park de Lille 🇫🇷 France 2 of 3 in captivity
13 Adventure Aquarium 🇺🇸 United States 2 of 3 in captivity
14 Audubon Zoo 🇺🇸 United States 2 of 3 in captivity
15 Bandung Zoo 🇮🇩 Indonesia 2 of 3 in captivity
16 Birmingham Zoo 🇺🇸 United States 2 of 3 in captivity
17 Blue Planet Aquarium 🇬🇧 United Kingdom 2 of 3 in captivity
18 Buin Zoo 🇨🇱 Chile 2 of 3 in captivity
19 Centro de Recuperação de Animais Silvestres 🇵🇹 Portugal 2 of 3 in captivity
20 El Paso Zoo 🇺🇸 United States 2 of 3 in captivity

Before you go

Where is the best place to see Apes of Sumatra?

Gunung Leuser National Park

In Gunung Leuser National Park, Indonesia, the chance of seeing all 3 (sumatran orangutan, siamang and lar gibbon) on the same day is about 10%, the highest of the 1 park where all of them live, and over a three-day visit it rises to about 50%. It multiplies each animal's daily chance, as if they were independent, so read it as a rough guide.

Which of Apes of Sumatra is hardest to see?

Siamang

In Gunung Leuser National Park, the best park for Apes of Sumatra, about about 30% of wildlife watchers report the siamang on a given day, against about 80% for the sumatran orangutan. The hardest one decides how many days you need.

How do you complete Apes of Sumatra on Wallace's Line?

Mark them as seen

Tick ✓ Seen on each animal's card, add your trips, or link your iNaturalist account. Your passport counts Apes of Sumatra three ways: anywhere in the world, all in one park, and all in a single trip.

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