Orangutan are among the most intelligent primates and use a variety of sophisticated tools, also making sleeping nests each night from branches and foliage.
They are generally not aggressive and live a mostly solitary life foraging for food. They are the largest living arboreal animals with longer arms than other great apes. Their hair is typically reddish-brown, instead of the brown or black hair typical of other great apes.
Native to Indonesia, orangutans are currently found only in rainforests on the islands of Borneo and Sumatra, though fossils have been found in Java, the Thai-Malay Peninsula, Vietnam and China. There are only two surviving species, both of which are endangered: the Bornean Orangutan (Pongo pygmaeus) and the critically endangered Sumatran Orangutan (Pongo abelii). The word "orangutan" comes from the Bahasa Indonesian words "orang" (man) and "(h)utan" (forest); hence, "man of the forest". (wiki)
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