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Bird ranges shift north, but not as fast as climate


PhysOrg

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(PhysOrg.com) -- As warmer winter temperatures become more common, one way for some animals to adjust is to shift their ranges northward. But a new study of 59 North American bird species indicates that doing so is not easy or quick -- it took about 35 years for many birds to move far enough north for winter temperatures to match where they historically lived.

 

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