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Common shelduck (Vịt khoang, Tadorna tadorna)

The common shelduck (Tadorna tadorna) is a waterfowl species of the shelduck genus, Tadorna. 
The bird is widespread and common in the Euro-Siberian region of the Palearctic, breeding in temperate regions and wintering in subtropical regions.
This species is mainly associated with lakes and rivers in open country, breeding in rabbit burrows, tree holes, haystacks or similar. In winter it is common on suitable estuaries and tidal mudflats as well.

anser: Latin anser goose;
anas, anatis: Latin duck.
The genus Tadorna name comes from the French name Tadorne for the common shelduck.

Ruddy shelduck (Vịt vàng, Tadorna ferruginea), known in India as the Brahminy duck
formerly placed in the genus Anas. Some authorities place it in the genus Casarca.

The ruddy shelduck (Tadorna ferruginea) is a bird species in the family Anatidae.
The species is a migratory bird, wintering in the Indian subcontinent and breeding in southeastern Europe and central and eastern Asia; small resident populations found in North Africa. 

anser: Latin anser goose;
anas, anatis: Latin duck.
The genus Tadorna name comes from the French name Tadorne for the common shelduck.
The species name ferruginea is Latin for "rusty" and refers to the colour of the plumage.

Tadorna is a genus of ducks whose species comprises most shelducks in the family Anatidae. 
The genus Tadorna name comes from the French name Tadorne for the common shelduck.

1/ Common shelduck (Vịt khoang, Tadorna tadorna)
2/ Ruddy shelduck (Vịt vàng, Tadorna ferruginea), known in India as the Brahminy duck
formerly placed in the genus Anas. Some authorities place it in the genus Casarca.
The species name ferruginea is Latin for "rusty" and refers to the colour of the plumage.