Pacific reef heron 
(Cò đen, Egretta sacra), also known as the eastern reef heron or eastern reef egret

The Pacific reef heron (Egretta sacra), also known as the eastern reef heron or eastern reef egret, is a species of heron found throughout southern Asia and Oceania.

Ardeidae, Ardea: the Latin word ardea meaning "heron".
The genus name comes from the Provençal French for the little egret, aigrette, a diminutive of aigron, "heron".
In Latin, "sacra" is a plural noun referring to "sacred things" or religious rites.