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This is often to avoid possible predators in Sumatran Tigers which roam similar habitats. Sumatrans encounter threats such as logging (both legal and illegal), wholesale conversion of forest to agricultural land and oil palm plantations,[24] and fragmentation by roads. While in captivity, the orangutans are at risk to the "Captivity Effect": animals held in captivity for a prolonged period will no longer know how to behave naturally in the wild. Compared with the Bornean orangutan, the Sumatran orangutan tends to be more frugivorous and especially insectivorous.
[1], While poaching generally is not a huge problem for the Sumatrans, occasional local hunting does decrease the population size. [25], The Sumatran orangutan is endemic to the north of Sumatra. Pythons can wrap themselves around an orangutan very tightly and hold on even though these animals are very strong and powerful. Females are able to give birth up to 53 years of age, based on studies of menopausal cycles. They also can climb into the trees so if they aren’t having much luck finding food on the ground they will go up higher. It seems that as the natural habitats in the rainforests are getting smaller the orangutans face more threats from the tigers.
The penalties for harming them or killing them isn’t very severe either. [29] This type of habitat conservation approach has been pursued by the World Wide Fund for Nature, who joined forces with several other organizations to stop the clearing of the biggest part of remaining natural forest close to the Bukit Tigapuluh National Park. Often, this is done by burning the forest first. These primarily target young animals. The primary predators currently of Sumatran orangutans are humans (Homo sapiens). Humans present the largest threat to Sumatran orangutans. Male Sumatran orangutans grow to about 1.7 m (5.6 ft) tall and 90 kg (200 lb). They will then be placed in captivity such as in zoos for the rest of their lives. The orangutan weighs between 2 and 6 kilograms. For commercial aspects, hunts for both dead or live specimens have also been recorded as an effect of the demand by European and North American zoos and institutions throughout the 20th century. [18] When there is low ripe fruit availability, Sumatran orangutans will eat the meat of the slow loris, a nocturnal primate. Mosquitoes disturb orangutans just as they disturb human beings. The latter approach has better prospects for ensuring long-term stability of populations.
[5], Nonja, thought to be the world's oldest orangutan in captivity or the wild at the time of her death, died at the Miami MetroZoo at the age of 55. There is no truth to them being meat eaters or hunting humans. Females are smaller, averaging 90 cm (3.0 ft) and 45 kg (99 lb). Sumatran orangutans have the longest birth intervals among mammals. Males, however, enter a stage called sub-adulthood.
Oil companies use a method of deforestation to re-use land for palm oil. There is no indication of menopause. [18] Their main diet can be broken up into five categories: fruits, insects, leaf material, bark and other miscellaneous food items. That is often a story told to try to justify the killing of these animals though. The fact that they are found almost always in the trees helps to protect them from a variety of land animals. [15], As of 2019, the world's oldest orangutan in captivity or the wild is Inji, who celebrated her 59th birthday at the Oregon Zoo on January 30. Six intentional meanings were identified: Affiliate/Play, Stop action, Look at/Take object, Share food/object, Co-locomote and Move away. The Pakpak Barat population in particular is the only Sumatran population predicted to be able to sustain orangutans in the long run, given the current effects of habitat displacement and human impact. They are one of the few animals with the ability to get into the trees though so there isn’t much competition when it comes to feeding on the orangutans.
[9], A repertoire of 64 different gestures in use by orangutans has been identified, 29 of which are thought to have a specific meaning that can be interpreted by other orangutans the majority of the time. Finally, male Sumatrans orangutans reach adulthood at 13 to 15 years of age.
The orangutans are the heaviest mammals to travel by tree, which makes them particularly susceptible to the changes in arboreal compliance.
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