Baer's pochard (Vịt đầu đen, Aythya baeri) 

Baer's pochard (Aythya baeri) is a diving duck found in eastern Asia. 
The bird is a resident bird in North and Central China, and formerly bred in southeast Russia and Northeast China, migrating in winter to southern China, Vietnam, Japan, and India. 

The name Anseriformes comes from the Latin word "anser," meaning "goose," and the Greek-derived suffix "-iformes," meaning "having the form of". Therefore, "Anseriformes" literally means "goose-shaped"
anas, anatis: Latin duck.
The name Aythya comes from the Ancient Greek word authuia, which may have referred to a sea-dwelling duck or an auklet.