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.

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