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Operation Migration is a non-profit, charitable organization, which developed a method utilizing ultralight aircraft to teach migration to captive-raised, precocial bird species such as Canada geese, Trumpeter swans, Sandhill cranes and most recently, endangered Whooping cranes. Operation Migration Canada was founded in 1994 as a Canadian registered charity. Operation Migration-USA Inc was established in 1999 as a 501(c)(3) non-profit organization. In collaboration with the (Whooping Crane Eastern Partnership ), Operation Migration has played a leading role in the reintroduction of endangered Whooping cranes into eastern North America since 2001. In the 1940s the species was reduced to just 15 birds. It is believed that approximately 1,400 whooping cranes existed in 1860. Their population declined because of hunting and habitat loss until 1941 when the last migrating flock dwindled to an all-time low of 15 birds. The wild flock has slowly increased to over 180 in late 1999. This flock winters in and around Aransas National Wildlife Refuge on the Gulf coast of Texas. In spring, they migrate north, nesting in Wood Buffalo National Park, which straddles the border of Alberta and Northwest Territories in Canada. This flock of whooping cranes is the only naturally occurring wild population in the world. Scientists have long recognized the risk of having all of the wild whooping cranes using one wintering and breeding location. With all the wild birds concentrated in one small area, the population could be wiped out by disease, bad weather, or human impacts. Whooping crane survival depends on additional, separated populations.〔(Operation Migration-Our Work )〕 Imprinting, Training and Releasing Cranes The whooping crane chicks are transported to Wisconsin in June where they are conditioned to follow ultralight aircraft in preparation for their fall migration to wintering grounds in Florida. Pilots lead the birds on training flights over the White River Marsh State Wildlife Area in Green Lake County, Wisconsin throughout the summer to build the birds' stamina. Each year since 2001, a class of cranes has been led on their first migration south from Wisconsin to Florida's Gulf Coast. Beginning in 2005 the ultralight-led migration was supplemented with a second reintroduction technique called Direct Autumn Release (DAR). Young cranes are released in small groups with older, now wild whooping cranes, with the intent that they will learn the migration route from these more experienced birds. After learning the migration route by following the ultralight aircraft or older cranes to the wintering areas, the young cranes make the return flight to their summering grounds in the north on their own the following spring. In December 2011, the Operation Migration escorting of nine cranes was interrupted by the Federal Aviation Administration due to a regulation prohibiting paid pilots of ultralight aircraft. After a month with the cranes kept in a pen, the FAA finally granted a one-time exemption to allow completion of the migration.〔(Whooping cranes are cleared for takeoff after getting FAA exemption ) - CNN January 10, 2012 - accessed July 8, 2013.〕 ==See also== * ''Fly Away Home'', feature film dramatization of Operation Migration 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「Operation Migration」の詳細全文を読む スポンサード リンク
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