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Eurasian wigeon or European wigeon 
(Vịt đầu vàng, Mareca penelope), also known as the widgeon or the wigeon

The Eurasian wigeon or European wigeon (Mareca penelope), also known as the widgeon or the wigeon, is one of three species of wigeon in the dabbling duck genus Mareca. 
The bird is common and widespread within its Palearctic range.

The name of the genus Mareca is from the Portuguese word Marreco for a small duck.
The epithet name penelope derives from Ancient Greek pene, "braid" and ops "appearance".

Falcated duck or falcated teal 
(Vịt lưỡi liềm, Mareca falcata)

The falcated duck or falcated teal (Mareca falcata) is a gadwall-sized dabbling duck from the east Palearctic (East Siberia and Mongolia to North Japan; wintering to India).
This dabbling duck is strongly migratory and winters in much of Southeast Asia.

The name of the genus Mareca is from the Portuguese word Marreco for a small duck.
"Falcata" comes from the Latin word falcatus, meaning "sickle-shaped" or "curved like a sickle". 

Gadwall (Vịt cánh trắng, Anas strepera) is a common and widespread dabbling duck in the family Anatidae.

Gadwall (Vịt cánh trắng, Mareca strepera)

The gadwall (Mareca strepera) is a common and widespread dabbling duck in the family Anatidae.
The gadwall breeds in the northern areas of Europe and across the Palearctic, and central North America and is seen in southern Asia.

The name of the genus Mareca is from the Portuguese word Marreco for a small duck.
The specific name strepera is Late Latin for "noisy".
The etymology of the word gadwall is not known.

Mareca is a genus or subgenus of ducks in the family Anatidae that includes the wigeons.
The name of the genus is from the Portuguese word Marreco for a small duck.[
The species were formerly placed in the genus Anas.

1/ Gadwall (Vịt cánh trắng, Mareca strepera)
2/ Eurasian wigeon or European wigeon (Vịt đầu vàng, Mareca penelope), also known as the widgeon or the wigeon
The epithet name derives from Ancient Greek pene, "braid" and ops "appearance"

3/ Falcated duck or falcated teal (Vịt lưỡi liềm, Mareca falcata)