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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.

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.