P. L. Sclater, 1878,
Hitherto included within A. platyrhynchos. Genetic data suggest that it is descended from a hybridization event between A. platyrhynchos and A. laysanensis occurred around the Pleistocene–Holocene boundary#R. Probable unstable hybrids of A. superciliosa and present species, A. laysanensis or A. platyrhynchos, found on some Micronesian islands, have been considered a different species, Mariana Duck (A. oustaleti). Superficially resembles A. fulvigula, but differs in blue-green vs green-blue speculum (2); broad white lower edge to speculum (1); white eyering (2); streaking below less pronounced, heavy and continuous (ns); smaller in size, mean male weight 638 g vs 1043 g in fulvigula and 1028 g in diazi, resulting in a “44% decrease in body mass and in dimensions”#R (3). Monotypic.
Kaua’I and Ni’ihau, in Hawaiian Is. Reintroduced on O’ahu, Hawaii (Big I) and Maui.
Food and feeding
Status and conservation
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