Whooping cranes taught to migrate over a 15 year period by using ultralight airplanes to lead them: http://operationmigration.org/ http://operationmigration.or

Whooping cranes taught to migrate over a 15 year period by using ultralight airplanes to lead them: http://operationmigration.org/ http://operationmigration.org/ More recently they've stopped because it's unclear if it's working.