コガモ
The Eurasian teal belongs to the "true" teals, a group of small "Anas" dabbling ducks closely related to the mallard ("A. platyrhynchos") and its relatives; that latter group in fact seems to have evolved from a true teal. It forms a superspecies with the green-winged teal and the speckled teal ("A. flavirostris"). A proposed subspecies, "A. c. nimia" of the Aleutian Islands, differs only in slightly larger size; it is probably not distinct.