Sometimes considered to include some or all of A. laysanensis, A. rubripes, A. fulvigula and A. wyvilliana. Probable unstable hybrids of A. superciliosa and A. laysanensis, A. wyvilliana or present species, found on some Micronesian islands, have been considered a different species, Mariana Duck (A. oustaleti). Hybridization recorded with at least 23 other species of Anas, often producing fertile progeny, and also with several species of Aix, Alopochen, Anser, Branta, Tadorna, Cairina, Aythya and Somateria. Proposed race neoborea is synonymized with nominate. Two subspecies recognized.
Introduced to South Africa, Mauritius, Australia and New Zealand, among others.
Food and feeding
Status and conservation
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