Greater scaup 
(Vịt biển, Aythya marila), scaup in Europe, or "bluebill" in North America

The greater scaup (Aythya marila), just scaup in Europe or "bluebill" in North America, is a mid-sized diving duck of the family Anatidae.
The bird spends the summer months breeding in Iceland, east across Scandinavia, northern Russia and Siberia, Alaska, and northern Canada. 
During the winter, it migrates south to the coasts of Europe, eastern Asia, and North America.

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"
The name Aythya comes from the Ancient Greek word authuia, which may have referred to a sea-dwelling duck or an auklet.
The epithet marila is from the Greek word for charcoal embers or coal dust.