• NATIONAL PARK

    Gunung Leuser National Park is part of the 2.6 million hectre Leuser Ecosystem, considered to be one of the last strongholds for the critically endangered Sumatran orangutan, an amazing habitat. Read More
  • ADVENTURE & TREKKING

    Whether you are an experienced adventure traveller or a first time visitor to Sumatra, we can help you explore and learn about local wildlife, culture, and lifestyle! Read More
  • RAINFOREST FAUNA

    GUNUNG LEUSER NATIONAL PARK Straddling the border of the province of North Sumatra, and covering 1,094,692 hectares lies the famous Gunung Leuser National Park. Read More
  • 2 DAY ECO TOUR

    An exquisite tour viewing the charismatic Sumatran orangutan, then taking a tour through the village. Read More
  • 3 Day ORANGUTAN TREK

    Fancy seeing wildlife, spending time with the locals? Trek begins, Bukit Lawang's famous orangutan feeding in the Gunung Leuser National Park. Read More
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SUMATRAN RAINFOREST GLNP FAUNA

Sumatran Orangutan (Pongo abeli)
The Sumatran orangutan Pongo abeli is the only great ape species found in Asia. They are classified by IUCN as critically endangered, with an estimated population of 6,600 left in the wild (Bornean orangutans P. Pygmaeus are classified as endangered, with an estimated population of 55,000). The two genetically distinct species differ morphologically, with the Sumatran orangutan having lighter coloured hair, more pronounced beards and moustache, narrower cheekpads and a longer, thinner frame than their Bornean counterparts.
Main threats to the orangutan are human encroachment, the highly illegal pet trade and the high demand for palm oil, which is clearing huge areas of forest for plantations.


Siamang (Symphalangus syndactylus)
These lesser apes are all black with a stocky build. Adults have a throat sac which they inflate when making their calls and producing a duet for a pair bounding function. They primarily eat fruit in Sumatra (though eat more leaves in their mainland range), and are strictly aboreal and are expert climbers and swingers.


White-handed or Lar Gibbon (Hylobates lar)
The white-handed gibbon is distinct due to its white face, hands and feet. Body colur varies from black to red, with no relation to age or sex. Males are larger (5-8kg) than females (4-7kg), and have a home range from 16-54ha. This species largely eat fruit, leaves, shoots, some flowers and insects. They swallow most of the fruits seeds, making them one of the most important seed dispersers in the jungle!


Thomas Leaf Monkey (Presbytis thomasi)
This is often described by the local guides as the 'funky monkey' due to its mowhawk like hair on its head which is very distinct. This species is endemic to Northern Sumatra primarily eating leaves, fruits and flowers. Animals live in single male, multi female groups, where the male protects the group. The average group size is 6 individuals.


Long-tailed Macaque (Macaca fascicularis)
These are one of the more common species you will see, normally around the village. Body fur varies from grey to reddish brown with lighter underparts. Males weigh 5-8kg, whilst females are about 3-6kg. Fruit makes up 64% of their diet, with seeds, buds, leaves and animal prey also being consumed. Long-tailed macaques are good swimmers and will jump into the water from nearby trees. They live in multi-male multi-female troops between 10-100 individuals!

Pig-tailed Macaque (Macaca nemestrina)
The pig-tailed macaque is characterised by its short tail that resembles a pig's. They have a brown coat with a lighter underside and long legs. Males have mane like hair surrounding their face, giving them a majestic appearance. Females develop large sexual swellings on their rumps when they are receptive to mating. Females weigh about half that of the males, with females 4-10kg and males 6-14kg. Pig-tails are generally terrestrial, but they do spend some of their time in the trees.


Sumatran Elephant (Elephas maximuns sumatranus)
Sumatran elephants are the smallest of the elephants. The ears are smaller and the back is more rounded, therefore the crown of the head is the highest point of its body. Elephants range over large areas, about 130-160km2 in females and 53-345km2 for males. Due to their size, (and energy requirements) the Sumatran elephant needs to consume approximately 150-300kg of plant matter every day!!! They spend up to 19 hours a day feeding, and can defecate 18 times in one day!


Sumatran Rhino (Dicerorhinus sumatrensis sumatrensis)
The Sumatran Rhino is the smallest and most endangered of the five living rhinoceros species. The body is a reddish brown colour and may be covered with long hair, making the species known as the 'hairy rhinoceros'. The Sumatra Rhino also has two horns like its African counterparts and weighs between 500-800kg. Their home range can be up to 5,000ha in males, and 1,500 for females. These animals are browsers, consisting of a diet of young saplings, leaves, fruits and shoots. Sumatran Rhinos are a solitary and secretive species, often spending the day in mud wallows to keep cool and protect their skin from drying out.


Malayan Sun Bear (Helarctos malayanus)
The Malayan sunbear is one of the smallest of the bears, and their body is covered dark black or brown fur, except for the chest where there is a horseshoe shaped pale orange-yellow marking. Sun bears are omnivores, feeding on termites, ants, beetle larvae, bee larvae and honey, and a large variety of fruit species, including figs. They are dimorphic, males weighing 40-60kg and females 20-40kg. Home ranges are between 9-15ha.


Sumatran Tiger (Panthera tigris sumatrae)
The Sumatran Tiger is the smallest of all the existing tiger sub-species, males weigh approx. 146kg, whilst females about 91kg. Home ranges are narrow, and are around where prey is abundant (20km2). Diet consists of wild pigs, various deer species, as well as rodents, insects and reptiles. The Sumatran Tiger needs to kill approximately 50 large prey animals a year to survive. Generally, this species is solitary, with adult males maintaining exclusive territories. The Gunung Leuser National Park holds the largest population of Sumatran Tigers, about 110 individuals. Others live in unprotected areas.

Area information, Indonesian rainforest