Muscovy duck
The Muscovy duck was formerly placed into the paraphyletic "perching duck" assemblage, but subsequently moved to the dabbling duck subfamily (Anatinae). Analysis of the mtDNA sequences of the cytochrome "b" and NADH dehydrogenase subunit 2 genes, however, indicates that it might be closer to the genus "Aix" and better placed in the shelduck subfamily Tadorninae. In addition, the other species of "Cairina", the rare white-winged duck ("C. scutulata"), seems to belong to a distinct genus ("Asarcornis").