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Polar vortex, winter heat may change bird populations

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Researchers set out to learn how extreme winter cold and heat affected 41 common bird species in eastern North America. They found that individual bird species respond differently to these weather events, and extreme winter heat may lead to longer-term changes in bird populations.http://feeds.feedburner.com/~r/sciencedaily/plants_animals/birds/~4/kzKciC3qHIE

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