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The island is divided politically along east-west lines, roughly into equal halves. The portions of the island of New Guinea (Irian in Bahasa Indonesia) located west of 141°E longitude are incorporated into Indonesia as the province of Papua. A longstanding active separatist movement has sought independence for the area. The eastern part, Papua New Guinea, has been an independent country since 1975.
Populated by nearly a thousand different Papua Melanesian tribal groups since 45,000 BC, it is the home of the world's oldest independent societies and a staggering number of separate languages, the Papuan languages.
With some 786,000 km² of tropical land, New Guinea has an immense ecological value: 11,000 plant species; nearly 600 unique bird species, including the birds of paradise; over 400 amphibians; 455 butterflyFor other uses of the term "butterfly", see butterfly (disambiguation). Superfamily Hesperioidea: Hesperiidae Superfamily Papilionoidea: Papilionidae Pieridae Nymphalidae Lycaenidae Riodinidae Libytheidae Lyceanidae A butterfly is a flying insect of the o species; marsupialSuperorder Ameridelphia Didelphimorphia Paucituberculata Superorder Australidelphia Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Marsupials are mammals in which the female typically has a pouch (called the marsupium from whs including bondegezou , Goodfellow's tree kangarooAbout 9; see text. Tree kangaroos are macropods adapted for aboreal life. They are found only in the rainforests of New Guinea, far north-eastern Queensland, and nearby islands, usually in mountainous areas. It is understood that tree kangaroos evolved fr, Huon tree kangaroo, long-beaked echidna, tenkile , alpine wallabyFor the Australian national Rugby Union team, nicknamed the Wallabies see Australia national rugby union team. A wallaby (sometimes (erroneously?) spelt wallabee is any of about 30 species of macropod. Essentially, a wallaby is any macropod that isn't con, cuscus and possumA possum is any of about 25 small to medium-sized arboreal marsupials native to Australia. The name derives from their resemblance to the opossums of the Americas and, unlike most names applied to Australian fauna in the early years of European colonisatis; and various other mammal species. Most of these species are shared, at least in their origin, with the continent of Australia, which was until fairly recent geological times, part of the same landmass. See Australia-New GuineaAustralia-New Guinea also called Meganesia is made up of the continent of Australia and the islands of New Guinea and Tasmania. Although these land masses are separated by the Torres Strait (Australia and New Guinea) and the Bass Strait (Australia and Tas for an overview.