Mandarin duck (Uyên ương, Aix galericulata)

The mandarin duck (Aix galericulata) is a perching duck species native to the East Palearctic.

Aix is a bird genus that contains two species of ducks: the wood duck (Aix sponsa), and the mandarin duck (Aix galericulata). 
Aix is an Ancient Greek word used by Aristotle to refer to an unknown diving bird.
In Greek, αἴξ (aíx) means goat or a kind of waterfowl. In Latin, it is aex or aqua (from which words like Aix-en-Provence are derived).
'galericulata' is the Latin for a wig, derived from galerum, a cap or bonnet.