Orangutans (or orangutan, other names are unaware) is a kind of great apes with long arms and a hairy reddish or brown, who live in the tropical forests of Indonesia and Malaysia, especially on the island of Borneo and Sumatra.
you've seen orangutans see video below
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for more details you can see
Sumatraorangutan.org
you are interested to see orangutans in Sumatra visit here
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