Parent: Pelecaniformes (Pelicans)

└─ Ardeidae (Bitterns)

└─── Agamia

└─── Ardea (Great herons)

└─── Ardeola

└─── Botaurus (Brown bitterns)

└─── Bubulcus (Cattle egrets)

└─── Butorides (Green-backed herons)

└─── Cochlearius

└─── Dupetor

└─── Egretta (Plumed egrets)

└─── Gorsachius

└─── Ixobrychus (Least bitterns)

└─── Nyctanassa

└─── Nycticorax (Night-herons)

└─── Pilherodius

└─── Syrigma

└─── Tigriornis

└─── Tigrisoma

└─── Zebrilus

└─── Zonerodius