On April 22, I drove down to Arlington, Va., a suburb of Washington, D.C., with my daughter, Angela, who was visiting me from California. It was a bright sunny day with nary a cloud and not much of a wind. From New Jersey through Delaware through Maryland to Virginia, the sky over the highways 60 to 100 feet above the pavement was filled with sailing turkey vultures. We must have seen more than 25, mostly singles, sometimes in pairs.