Yellow bittern 
(Cò lửa lùn, Botaurus sinensis)

The yellow bittern (Botaurus sinensis) is a small bittern of the Old World origins in the family Ardeidae.

Pelecanus: Greek pelekan, pelekanos pelican.
Ardeidae, Ardea: the Latin word ardea meaning "heron".
The genus name Botaurus is derived from Medieval Latin butaurus, Bos (ox) and taurus (bull), because the bittern's call resembles the bellowing of a bull.