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Orangutans


Basic facts


A young orangutan

The name orangutan comes from the Malay words "orang" - human, and "hutan" - forest. Orangutans have often been confused for wild humans. Orangutans currently only inhabit Borneo Island and a small part of Sumatra Island. However, fossil evidence indicates that their past distribution included much of Southeast Asia.

Physically, orangutans have a thin, shaggy coat that is reddish brown in color. They have short, weak legs, but strong hands and arms. A fully-grown orangutan is about 1.5 meters tall, or just slightly shorter than a human. Their arms have a spread of about 2.2 meters. Female orangutans weigh about 30-50 kg, while males are from 50 - 90 kg. Dominant males also have large cheek pads, which continue growing for much their lives.

A young orangutan clings to its mother's abdomen by entwining its fingers in and gripping her fur until it is a year old, then it begins to ride on her back, which it may continue to do until 2.5 years of age. An infant will scream loudly if separated from its mother. Maturity is achieved at 7 years for females, while males reach maturity at about 14 years of age. Female orangutans will wait at least 4 years between having children, and it can be longer if conditions are poor. Maturity is achieved at 7 years for females, while males reach maturity at about 14 years of age.

Their diet consists mainly of fruit, especially figs. In fact, figs ripen at different times in the year, and the movement pattern of the animals can largely be explained by their following this process. Orangutans will also eat other kinds of vegetation, such as leaves, bark, buds, and flowers. Occasionally, they will also eat mineral-rich soil, insects, and even eggs and small vertebrates. They drink by reaching into tree holes and lapping water from their hands.


The orangutan's range is marked in grey.
The data comes from the early 1980's -
their range has since greatly decreased.
(from http://www.orangutan.org/
facts/distribution.php)

Is time running out?

Unfortunately, the orangutan is a seriously endangered species. It has declined in both range and numbers for many years and is now in danger of becoming extinct. Humans are the overwhelmingly major threat. Much of their habitat is clear cut, primarily for logging, and also agriculture. The orangutans' survival is constantly threatened by forest fires, felling of trees, and illegal hunting. There are only approximately 15,000 orangutans left in the wild.

Humans have a long history of hunting this particular primate for various reasons, more recently for exhibition in zoos. Many people keep them for pets, at while they are young. It is estimated that at least 3 orangutans die for each one that is successfully captured and transported. The capture and sale of baby orangutans especially is a worldwide problem, a practice that continues despite the many government and non-government organizations created to eliminate the exploitation of endangered wildlife.


Here are locations of orangutan rehabilitation centers helping former pets survive in the wild.
(from http://www.yorku.ca/arusson)

 


New Orangutan Population in Sangkulirang, East Kalimantan
March 30th, 2009

Orang Metropolis Uncovered
National Public Radio
November 20th, 2002
Newly Found Population a Boost for Conservation

Only 2,000 Orang-utans Left in Sarawak
The Star
October 15th, 2002
KUCHING: The population of orang-utans, one of the world’s endangered species once found in abundance, has dropped to some 2,000 in Sarawak due logging activities and illegal hunting.

Saving Orangutans Means Saving The Forests
by Tantri YuliandiniThe Jakarta Post
February 14th, 2002
Once upon a time, orangutans (Pongo pymaeus) roamed thousands of miles across southern China and Southeast Asia. In the wild, today, they can only be found on the islands of Kalimantan and Sumatra.

Explorer's Notebook: Orangutans Headed Toward "Catastrophe"
by Jennifer HileNational Geographic Today
November 23rd, 2001
While filming them in southern Borneo, I quickly learned not to leave bags unattended. My tripod cover, flip-flop sandals, and sunscreen were among the items I never recovered. The orangutans I was filming are all orphans. Their mothers were killed in the wild.

Indonesian Trade Ban on Rainforest Wood Aids Orangutans
Environment News Service
August 6th, 2001
The government of Indonesia has banned the export and domestic trade in ramin (Gonystylus bancanus) due to continued illegal logging of this valuable tree species within several of Indonesia's National Parks that provide habitat for the endangered orangutan, Asia's only great ape.