A recent paper dealing with the identification of Ferruginous Duck Aythya nyroca (Vinicombe 2000) included some discussion on hybrids between that species and Common Pochard A. ferina. Vinicombe's advice, that if a putative Ferruginous Duck shows any anomalous feature, no matter how small, then hybrid parentage cannot be eliminated, is sound indeed. The treatment of female hybrids may, however, mer


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