MILWAUKEE - All 18 young whooping cranes led south from Wisconsin by ultralight aircraft last fall 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. The cranes were being kept in an enclosure at the Chassahowitzka National Wildlife Refuge near Crystal River, Fla., when the storms moved in and intensified Thursday night, said Joe Duff, senior pilot and co-founder of Operation Migration, a nonprofit organization coordinating the project. "The birds were checked in late afternoon the day before, and...