Black Bittern
(Cò hương, Ixobrychus flavicollis) 

The black bittern (Ixobrychus flavicollis) is a bittern of Old World origin. It is mainly resident, but some northern birds migrate short distances.

Ardeidae, Ardea: the Latin word ardea meaning "heron".
The genus name Ixobrychus combines the Ancient Greek ixias, a reed-like plant and brukhomai, to bellow.
flavicollis: flavi New Latin from flāvus (“yellow”); Modern Latin -collis, "-necked".