ヒドリガモ
The hens are much less conspicuous, having primarily gray and brown plumage. Both sexes have a pale blue bill with a black tip, a white belly, and gray legs and feet. The wing patch behind the speculum is gray. They can be distinguished from most ducks, apart from Eurasian wigeon, by shape. However, that species has a darker head and all grey underwing. The head and neck coloring of the female is different as opposed to the Eurasian wigeon. It nests on the ground, near water and under cover. It lays 6–12 creamy white eggs. Flocks will often contain American coots.