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Monoterritorial bigyny in the Pied Flycatcher Ficedula hypoleuca |
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| Authors: | WOLFGANG WINKEL |
| Affiliation: | Institut Für Vogelforschung Vogelwurte Helgoland, Aussenstution Bruunschweig, Bauernstr, 14, D-38162 Cremlingen-Weddel, Germany |
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