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Botaurus is a genus of bitterns, a group of wading bird in the heron family Ardeidae. 

1/  Eurasian bittern or great bittern (Vạc rạ, Botaurus stellaris)
The species name stellaris is Latin for "starred", from stella, "star", and refers to the speckled plumage.

Below species were merged into this genus from the genus Ixobrychus.
2/ Black bittern (Cò hương, Botaurus flavicollis) 
3/ Cinnamon bittern (Cò lửa, Botaurus cinnamomeus) or chestnut bittern
4/ Yellow bittern (Cò lửa lùn, Botaurus sinensis)
5/ Von Schrenck's bittern or Schrenck's bittern (Cò nâu, Botaurus eurhythmus)

Pelecaniformes, Pelecanus: Greek pelekan, pelekanos pelican.
Ardeidae, Ardea: Latin word 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.

Ixobrychus is a genus of bitterns, a group of wading bird in the heron family Ardeidae.

Ardeidae, Ardea: the Latin word ardea meaning "heron".
The genus name combines the Ancient Greek ixias, a reed-like plant and brukhomai, to bellow.

A molecular phylogenetic study of the heron family Ardeidae published in 2023 found that Ixobrychus was paraphyletic, Ixobrychus was merged into the genus Botaurus.

1/ Black bittern (Cò hương, Botaurus flavicollis) 
2/ Cinnamon bittern (Cò lửa, Botaurus cinnamomeus) or chestnut bittern
3/ Yellow bittern (Cò lửa lùn, Botaurus sinensis)
4/ Von Schrenck's bittern or Schrenck's bittern (Cò nâu, Botaurus eurhythmus)