Eurasian bittern 
or great bittern 
(Vạc rạ, Botaurus stellaris)

The Eurasian bittern or great bittern (Botaurus stellaris) is a wading bird in the bittern subfamily (Botaurinae) of the heron family Ardeidae.

Pelecaniformes, Pelecanus: Greek pelekan, pelekanos pelican.
Ardeidae, Ardea: Latin word meaning "heron".
Botaurus: derived from Medieval Latin butaurus, Bos (ox) and taurus (bull). 
stellaris: Latin for "starred", from stella, "star", and refers to the speckled plumage.