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Taxonomy:

Cinnamon Bittern, Ixobrychus cinnamomeus (Add)
Von Schrenck's Bittern, Ixobrychus eurhythmus (Add)
Least Bittern, Ixobrychus exilis (Add)

Ixobrychus exilis bogotensis (Add)
Ixobrychus exilis erythromelas (Add)
Ixobrychus exilis exilis (Add)
Ixobrychus exilis limoncochae (Add)
Ixobrychus exilis peruvianus (Add)
Ixobrychus exilis pullus (Add)

Ixobrychus involucris (Add)
Little Bittern, Ixobrychus minutus (Add)

Ixobrychus minutus minutus (Add)
Ixobrychus minutus payesii (Add)
Ixobrychus minutus podiceps (Add)

Ixobrychus novaezelandiae (Add)

Ixobrychus novaezelandiae dubius (Add)
Ixobrychus novaezelandiae novaezelandiae (Add)

Yellow Bittern, Ixobrychus sinensis (Add)
Dwarf Bittern, Ixobrychus sturmii (Add)