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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.
In collaboration with the Whooping Crane Eastern Partnership, Operation Migration has participated in the reintroduction of endangered Whooping cranes into eastern North America since 2001.
It is believed[by whom?] 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 Texas Gulf Coast. 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.
Imprinting, training, and releasing cranesEdit
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.
On 22 January 2016, the United States Fish and Wildlife Service announced that after the 2016 season it would end its support of the use of ultralight aircraft to lead whooping cranes from Wisconsin to the Florida Gulf Coast each autumn. A conclusion by experts in whooping crane biology that human intervention such as ultralight flights and costumed humans helping to care for chicks has impaired the ability of the cranes to learn the parenting skills necessary to raise chicks in the wild prompted the Fish and Wildlife Service's announcement: Despite the release of 250 whooping cranes in Wisconsin in 2001 – of which 93 survived in January 2016 – only 10 chicks have fledged and survived to adulthood and since 2005 only five breeding pairs have produced chicks that were born in the wild and fledged. Agreeing with the need to minimize human interaction with chicks, the International Crane Foundation supported the Fish and Wildlife Service's decision, although Operation Migration opposed it, claiming that the ultralight flights nonetheless help whooping cranes to survive.
|Wikimedia Commons has media related to Operation Migration.|
- Operation Migration-Our Work
- Whooping cranes are cleared for takeoff after getting FAA exemption - CNN January 10, 2012 - accessed July 8, 2013.
- "Whooping crane migration program ending". Al Jazeera America. Associated Press. 24 January 2016. Retrieved 18 February 2016.