Bird migration is the world's only true unifying natural phenomenon, stitching the continents together in a way that even the great weather systems fail to do. Scott Weidensaul follows awesome kettles of hawks over the Mexican coastal plains, bar-tailed godwits that hitchhike on gale winds 7,000 miles nonstop across the Pacific from Alaska to New Zealand, and myriad songbirds whose numbers have dwindled so dramatically in recent decades. Migration paths form an elaborate global web that shows serious signs of fraying, and Weidensaul delves into the tragedies of habitat degradation and deforestation with an urgency that brings to life the vast problems these miraculous migrants now face. Living on the Wind is a magisterial work of nature writing. - - Author and naturalist Scott Weidensaul has written more than two dozen books on natural history, including Living on the Wind: Across the Hemisphere with Migratory Birds, a Pulitzer Prize finalist; The Ghost with Trembling Wings, about the search for species that may or may not be extinct; and Of a Feather: A Brief History of American Birding. His newest book, The First Frontier: The Forgotten History of Struggle, Savagery and Endurance in Early America, will be published in February 2012. - - Weidensaul lectures widely on wildlife and environmental topics, and is an active field researcher, specializing in birds of prey and hummingbirds. He lives in the Appalachians of eastern Pennsylvania, the heart of the old colonial frontier.