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BIRD migrations are among the marvels of the natural world. This newest incarnation of the Atlas of Bird Migration, which now includes results from satellite tracking, is a graphic overview of them all, from auks to warblers and from Alaska to Australia. An abundance of maps, diagrams and photos showing which birds go where are accompanied by snippets on conservation or how particular migrations evolved, for example. A good book for browsing, or for when the kids ask, 鈥淲here does that bird go in winter?鈥�