American Wigeon

American Wigeon (Mareca americana) is a compact dabbling duck whose male has a white crown, green eye stripe and pink-brown body. The combination of body shape, bill structure, plumage pattern and voice provides the most useful field characters. Age, sex and season can alter its appearance, so identification should use several features rather than colour alone. This supports comparison with similar species in the field (Wikipedia, general species account).

It grazes short vegetation and takes aquatic plants on marshes, lakes and estuaries across its mainly North American range. Its movements and social behaviour vary through the year, with breeding birds generally more dispersed and non-breeding birds more likely to gather where food is concentrated. Japanese records place it within the country's documented avifauna as a resident, migrant, visitor or introduced bird (Wikipedia, general species account; Wildlife of Japan occurrence records).