The offspring of a mating between two different species are often infertile, or almost so. But it seems that some birds can avoid this apparent cost of hybridization.
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ZDENEK TUNKA/ARDEA/JACK A. BAILEY
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Hasselquist, D. Hybrid costs avoided. Nature 411, 34–35 (2001). https://doi.org/10.1038/35075190
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DOI: https://doi.org/10.1038/35075190
