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Aythya is a genus of diving ducks. The name Aythya comes from the Ancient Greek word authuia, which may have referred to a sea-dwelling duck or an auklet.

1/ Greater scaup (Vịt biển, Aythya marila), scaup in Europe, or "bluebill" in North America
The epithet marila is from the Greek word for charcoal embers or coal dust.
2/ Baer's pochard (Vịt đầu đen, Aythya baeri) 
3/ Common pochard (Vịt đầu đỏ, Aythya ferina), known simply as pochard

4/ Tufted duck or tufted pochard (Vịt mào, Aythya fuligula)
The epithet is from Latin fuligo 'soot' and gula 'throat'.

5/ Ferruginous duck (Vịt mặt trắng, Aythya nyroca), also known as ferruginous pochard, common white-eye or white-eyed pochard
The epithet is from nyrok, the Russian name for a duck.

Le genre Aythya comprend douze espèces. Leur nom normalisé est fuligule. Ce sont des canards plongeurs.

1/ Fuligule milouinan
Greater scaup (Vịt biển, Aythya marila), scaup in Europe, or "bluebill" in North America
The epithet marila is from the Greek word for charcoal embers or coal dust.

2/ Fuligule de Baer
Baer's pochard (Vịt đầu đen, Aythya baeri) 

3/ Fuligule milouin
Common pochard (Vịt đầu đỏ, Aythya ferina), known simply as pochard

4/ Fuligule morillon
Tufted duck or tufted pochard (Vịt mào, Aythya fuligula)
The epithet is from Latin fuligo 'soot' and gula 'throat'.

5/ Fuligule nyroca
Ferruginous duck (Vịt mặt trắng, Aythya nyroca), also known as ferruginous pochard, common white-eye or white-eyed pochard
The epithet is from nyrok, the Russian name for a duck.

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.

Common pochard 
(Vịt đầu đỏ, Aythya ferina), known simply as pochard

The common pochard (/ˈpɒtʃərd/; Aythya ferina), known simply as pochard in the United Kingdom, is a medium-sized diving duck in the family Anatidae. 
The bird is widespread across the Palearctic breeding primarily in the steppe regions of Scandinavia and Siberia, and wintering farther south and west.

The name Aythya comes from the Ancient Greek word authuia, which may have referred to a sea-dwelling duck or an auklet.
In Latin, "ferina" means "of wild animals" or "wild game," derived from the root "ferus" (wild).

Ferruginous duck 
also known as ferruginous pochard, common white-eye or white-eyed pochard
(Vịt mặt trắng, Aythya nyroca), 

The ferruginous duck (Aythya nyroca) is a medium-sized diving duck from Eurosiberia. 

anser: Latin anser goose.
anas, anatis: Latin duck.
Aythya: from the Ancient Greek word authuia, which may have referred to a sea-dwelling duck or an auklet.
nyroca: from nyrok, the Russian name for a duck.

Fuligule nyroca
Ferruginous duck 
also known as ferruginous pochard, common white-eye or white-eyed pochard
(Vịt mặt trắng, Aythya nyroca), 

Le Fuligule nyroca (Aythya nyroca) est une espèce d'oiseaux parfois citée sous le nom d’Anas nyroca appartenant à la famille des Anatidae, Anatidés.

anser: mot latin anser oie;
anas, anatis: mot latin pour canard.
Aythya: vient du mot grec authuia se référant à un canard marin.
nyroca: vient du mot nyrok, un nom russe pour un canard.

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.

Tufted duck or tufted pochard (Vịt mào, Aythya fuligula)

The tufted duck (or tufted pochard) (Aythya fuligula) is a small diving duck found in northern Eurasia. 
The duck is migratory in most of the range, and winters in the milder temperatures in southern and western Europe, southern Asia.

The name Aythya comes from the Ancient Greek word authuia, which may have referred to a sea-dwelling duck or an auklet.
The epithet fuligula is Latin fuligo 'soot' and gula 'throat' meaning sooty-throated.