Birds feel the heat, fly deeper north
China Daily | Updated: 2009-02-11 07:46
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A study of birds, including gulls (above), purple finch and chickadees, has found that they have moved their base northwards over the last 40 years. AP |
As the temperature across the US has gotten warmer, the purple finch has been spending its winters more than 640 km farther north than it used to. And it is not alone.
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