Borneo and Sumatra is Originally the islands were connected to each other and it is thought that they became separated approximately 40,000 years ago, allowing each species to evolve independently since then.
The Orangutan is one of our closest relatives and among the most ontelligent animal on earth. Althought fossil have been found across Asia in Java, Chine and Vietnam there are now just two areas were wild orangutans can be found.
Sumatran Oranutan (Pongo Abelii)
is the rarer of the two species of orangutans. Living and endemic to Sumatran Island Indonesia, they are smaller than the Borneo Orangutan.
Compared to the broadface Borneo Orangutan, the Sumatran Orangutan possess a lighter and longer pelage, a longer face, a smaller stature, and flanges that are covered in small white hairs
The Sumatran Orangutan is more social than its Bornean counterpart. Males and females generally come together only to mate. Groups of these orangutans gather to feed on the mass amount of fruiting on the fig trees. However adult males generally avoid contact with other adult males. Rape is common among orangutans. Sub-adult males will try to mate with any female, though they probably mostly fail to impregnate them since mature females are easily capable of fending them off. Mature females prefer to mate with mature males.
New Born Of Orangutan nurse every 3 to 4 hours, and begin to take soft food from their mothers’ lips by 4 months. The first year of its life the baby clings to its mother’s abdomen by entwining its fingers in and gripping her fur. Babies stay with their mothers until they are about 8 or 9 years old and have a long childhood compared to other apes.
Interval birth rates for Sumatran Orangutan were longer than the Bornean ones and are the longest reported interval birth rates among the great apes. Sumatran Orangutan give birth when they are about 15 years old. Infant Orangutans will stay close to their mother for up to three years. Even after that, the young will still associate with their mother.
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