Among the pairs of species compared in the study are the Yellow Warbler (left) and the Prothonotary Warbler— an obligate cavity nester. (IMAGE)

Duke University

Among the pairs of species compared in the study are the Yellow Warbler (left) and the Prothonotary Warbler— an obligate cavity nester.

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Among the pairs of species compared in the study are the Yellow Warbler (left) and the Prothonotary Warbler— an obligate cavity nester. 

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Photos courtesy of Shelby Lawson and Michael Jeffords

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Please credit Shelby Lawson and Michael Jeffords

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