**FILE** Ultralight pilot Joe Duff leads a small flock of whooping cranes on the longest ultralight-led migration with an endangered species in history as they depart Necedah National Wildlife Refuge in Necedah, Wis., in this Oct. 17, 2001, file photo. All 18 young whooping cranes led south from Wisconsin by ultralight aircraft were killed in storms that hit Florida, dealing a devastating blow to a project to create a second migratory flock of the endangered birds in North American, a spokesman said Friday Feb. 2, 2007. (AP Photo/Morry Gash)