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Contact: Joe Schwartz
Cornell University

Map of the Chickadee Hybrid Zone

Caption: The two chickadee species overlap in a narrow band across the eastern United States. This band has moved northward by seven miles in the last decade. Image courtesy Cornell Lab of Ornithology.

Credit: Cornell University Lab of Ornithology

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Related news release: Warming temperatures are pushing 2 chickadee species -- and their hybrids -- northward

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