Gadwall Mareca strepera strepera, breeding male, California, USA, January. Gadwall breeds across temperate Holarctic, including Northeast China and Xinjiang. In China winters south of Yangtze River. (Daniel Pettersson)Female Gadwall, Sweden, April. Orange sides to bill help distinguish from female Falcated DuckM. falcata and Mallard Anas platyrhynchos. (Daniel Pettersson)Gadwall, Cape Nanhui (30.881314, 121.962941), Shanghai, January. Gadwall is a passage migrant and winter visitor in Shanghai. (Craig Brelsford)
