Summary
A hybrid ofFicedula albicollis andF. hypoleuca, presumably from a back-cross toalbicollis, was observed in southern Finland in 1972–73. The hybrid bred with a pied female in both seasons, but it could not be ascertained whether the offspring were adopted or fathered by the hybrid male.
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Vepsäläinen, K., Järvinen, O. Ein Bastard-Männchen Halsband- × Trauerschnäpper (Ficedula albicollis × F. hypoleuca) brütet in Finnland. J Ornithol 118, 436–437 (1977). https://doi.org/10.1007/BF01643125
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DOI: https://doi.org/10.1007/BF01643125