A duck that breeds in eastern Siberia and winters in East Asia. In Hong Kong it is a scarce winter visitor to the Deep Bay area.
Breeding males have a striking green, yellow, black, and white face pattern and dark chest spots. Females also show a white bill-base spot and white throat.
Small numbers are recorded in Hong Kong during winter, mainly at fish ponds and gei wai.
An extinction-risk assessment has not been added yet.