ナンキンオシ Nettapus coromandelianus

Tiny duck. Male has a bright white head and neck with a dark crown and eyes. Female is plainer, with a strong dark eye-line that does not continue back to the nape. In flight, females have thin white edges on the trailing edge of the wings, while males have big white slashes on the wings. Usually seen swimming in freshwater wetlands, including small ponds and farm dams, especially those with extensive floating vegetation.