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In this May 5, 2012 file photo, an American Crow carries a dead fish in its beak as it flies above the beach in Bal Harbour, Fla. The critical ranges of more than half of the 588 North American bird species will either shrink significantly or move into uncharted territory for the animal, according to analysis by the society�s top scientist. While other studies have made similar pronouncements, this report gives the most comprehensive projections to what is likely to happen to America's birds. (Photo by Wilfredo Lee/AP Photo)
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