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Warming temperatures are pushing two chickadee species—and their hybrids—northward


PhysOrg

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The zone of overlap between two popular, closely related backyard birds is moving northward at a rate that matches warming winter temperatures, according to a study by researchers from the Cornell Lab of Ornithology, Villanova University, and Cornell University. The research will be published online in Current Biology on Thursday, March 6, 2014.

 

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