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orangutan : ウィキペディア英語版
orangutan

The orangutans (also spelled orang-utan, orangutang, or orang-utang)〔(【引用サイトリンク】title=orangutan: definition of orangutan in Oxford dictionary (British & World English) )〕 are the two exclusively Asian species of extant great apes. Native to Indonesia and Malaysia, orangutans are currently found in only the rainforests of Borneo and Sumatra. Classified in the genus ''Pongo'', orangutans were considered to be one species. However, since 1996, they have been divided into two species: the Bornean orangutan (''P. pygmaeus'') and the Sumatran orangutan (''P. abelii''). In addition, the Bornean species is divided into three subspecies. Based on genome sequencing, the two extant orangutan species evidently diverged around 400,000 years ago. The orangutans are also the only surviving species of the subfamily Ponginae, which also included several other species, such as the three extinct species of the genus ''Gigantopithecus'', including the largest known primate ''Gigantopithecus blacki''. The ancestors of the Ponginae subfamily split from the main ape line in Africa 16 to 19 million years ago (mya) and spread into Asia.
Orangutans are the most arboreal of the great apes and spend most of their time in trees. Their hair is typically reddish-brown, instead of the brown or black hair typical of chimpanzees and gorillas. Males and females differ in size and appearance. Dominant adult males have distinctive cheek pads and produce long calls that attract females and intimidate rivals. Younger males do not have these characteristics and resemble adult females. Orangutans are the most solitary of the great apes, with social bonds occurring primarily between mothers and their dependent offspring, who stay together for the first two years. Fruit is the most important component of an orangutan's diet; however, the apes will also eat vegetation, bark, honey, insects and even bird eggs. They can live over 30 years in both the wild and captivity.
Orangutans are among the most intelligent primates; they use a variety of sophisticated tools and construct elaborate sleeping nests each night from branches and foliage. The apes have been extensively studied for their learning abilities. There may even be distinctive cultures within populations. Field studies of the apes were pioneered by primatologist Birutė Galdikas. Both orangutan species are considered to be Endangered, with the Sumatran orangutan being Critically Endangered. Human activities have caused severe declines in the populations and ranges of both species. Threats to wild orangutan populations include poaching, habitat destruction, and the illegal pet trade. Several conservation and rehabilitation organisations are dedicated to the survival of orangutans in the wild.
==Etymology==
The name "orangutan" (also written orang-utan, orang utan, orangutang, and ourang-outang) is derived from the Malay and Indonesian words ''orang'' meaning "person" and ''hutan'' meaning "forest",〔(【引用サイトリンク】 url = http://www.etymonline.com/index.php?term=orangutan )〕 thus "person of the forest".〔(【引用サイトリンク】 url = http://animals.nationalgeographic.com/animals/mammals/orangutan.html )〕 ''Orang Hutan'' was originally not used to refer to apes, but to forest-dwelling humans. The Malay words used to refer specifically to the ape are ''maias'' and ''mawas'', but it is unclear if those words refer to just orangutans, or to all apes in general. The first attestation of the word to name the Asian ape is in Dutch physician Jacobus Bontius' 1631 ''Historiae naturalis et medicae Indiae orientalis'' – he reported that Malays had informed him the ape was able to talk, but preferred not to "lest he be compelled to labour". The word appeared in several German-language descriptions of Indonesian zoology in the 17th century. The likely origin of the word comes specifically from the Banjarese variety of Malay.
Cribb et al. (2014) suggest that Bontius' account referred not to apes (which were not known from Java) but rather to humans suffering some serious medical condition (most likely endemic cretinism) and that his use of the word was misunderstood by Nicolaes Tulp, who was the first to use the term in a publication.
The word was first attested in English in 1691 in the form ''orang-outang'', and variants with ''-ng'' instead of ''-n'' as in the Malay original are found in many languages. This spelling (and pronunciation) has remained in use in English up to the present, but has come to be regarded as incorrect.〔(【引用サイトリンク】title=Orangutan )〕 The loss of "h" in Utan and the shift from n to -ng has been taken to suggest that the term entered English through Portuguese.〔 In 1869, British naturalist Alfred Russel Wallace, co-creator of modern evolutionary theory, published his account of Malaysia's wildlife: ''The Malay Archipelago: The Land of the Orang-Utan and the Bird of Paradise''.〔
The name of the genus, ''Pongo'', comes from a 16th-century account by Andrew Battell, an English sailor held prisoner by the Portuguese in Angola, which describes two anthropoid "monsters" named Pongo and Engeco. He is now believed to have been describing gorillas, but in the 18th century, the terms orangutan and pongo were used for all great apes. Lacépède used the term ''Pongo'' for the genus following the German botanist Friedrich von Wurmb who sent a skeleton from the Indies to Europe.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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