Characteristics : The whole body length is about 37cm, and it is small size among the family of duck. The color of male’s head is reddish brown, from eyes to the back of neck is dark green. A narrow yellow line is placed between reddish brown and dark green, which is not well seen outdoors. It has a clear white lateral stripe on the side of the body. under tail covert is yellow and has black lines around. Unlikely other small ducks, female doesn’t have clear white dots or lines on the head. Secondaries are lustering green.
Ecology : Generally resting or feeding in a safe river, lake and elsewhere during the daytime, it moves to find food around evening.
Where you can see this species at Dongbaekdongsan : It which is a winter migratory bird comes to jeju and is sometimes observed to rest in the stagnant pond.