Warming brings more birds north in winter

Long-term global warming is prompting North American birds to winter farther north -- a trend more noticeable in Alaska than anywhere else in the nation, according to a new study by the National Audubon Society.

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<p><a href="http://www.physorg.com/news158261792.html">Warming brings more birds north in winter</a></p> <p> Long-term global warming is prompting North American birds to winter farther north -- a trend more noticeable in Alaska than anywhere else in the nation, according to a new study by the National Audubon Society.</p>