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The State Barrier Fence of Western Australia, formerly known as the Rabbit Proof Fence, the State Vermin Fence, and the Emu Fence, is a pest-exclusion fence constructed between 1901 and 1907 to keep rabbits and other agricultural pests, from the east, out of Western Australian pastoral areas.〔(【引用サイトリンク】title=State Barrier Fence overview )〕 There are three fences in Western Australia: the original No. 1 Fence crosses the state from north to south, No. 2 Fence is smaller and further west, and No. 3 Fence is smaller still and runs east–west. The fences took six years to build. When completed in 1907, the rabbit-proof fence (including all three fences) stretched . The cost to build the fences at the time was about £167 per mile ($250/km). When it was completed in 1907, the No. 1 Fence was the longest unbroken fence in the world.〔(【引用サイトリンク】title=The No. 1 Rabbit Proof Fence )〕 == History == Rabbits were first introduced to Australia by the First Fleet in 1788 and they become a problem when Thomas Austin released 24 wild rabbits for hunting purposes in October 1859, saying that "the introduction of a few rabbits could do little harm and might provide a touch of home, in addition to a spot of hunting."〔(【引用サイトリンク】title=The State Barrier Fence of Western Australia )〕 The rabbits were extremely prolific creatures and spread rapidly across the southern parts of the country. Australia had ideal conditions for a rabbit population explosion. By 1887, losses from rabbit damage compelled the New South Wales Government to offer a £25,000 reward for "any method of success not previously known in the Colony for the effectual extermination of rabbits". A Royal Commission was held to investigate the situation in 1901. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rabbit-proof fence」の詳細全文を読む スポンサード リンク
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