November 2001 – vol. 94, issue 11, pp 538–545 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... This article is only available to registered users.To read more, please log in or purchase a subscription.