Why birds vanish with the changing seasons remains a mystery until 1822 when a German teenager shoots down a white stork with a three-foot Mozambican spear impaling its neck. It is the first important clue in solving the puzzle of seasonal bird migration . . . In the newest eco mystery featuring the Sizzling Six, migratory birds connect teenagers living on different continents in a way they never could have imagined. White storks migrating from Europe...