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)