Blue Tit Parus caeruleus and Pied Flycatcher Ficedula hypoleuca breeding simultaneously in a nest-box
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Magnusson, A. (1989). Blue Tit Parus caeruleus and Pied Flycatcher Ficedula hypoleuca breeding simultaneously in a nest-box. Ornis Fennica, 66(4), 167–168. Hämtad från https://ornisfennica.journal.fi/article/view/133293