Scaly-sided merganser or Chinese merganser 
(Vịt mỏ nhọn, Mergus squamatus)

The scaly-sided merganser or Chinese merganser (Mergus squamatus) is an endangered typical merganser (genus Mergus).
The bird lives in Manchuria and extreme Southeast Siberia, breeding in the north and wintering in the south.

anas, anatis: Latin duck.
The genus name Mergus is a Latin word to refer to an unspecified waterbird.
Mergus is a Latin word meaning "diver" or "waterfowl," derived from the verb mergere, which means "to dip" or "plunge". It was used by ancient authors to refer to an unspecified diving seabird.
Squamatus is a Latin word meaning "scaly" or "covered with scales". The term originates from the Latin word squama, which means "scale".