Within Ardeidae , all members of the genera Botaurus and Ixobrychus are referred to as `` bitterns '' , and - including the Zigzag Heron or Zigzag Bittern - are a monophyletic group within the Ardeidae .
Within the family , all members of the genera Botaurus and Ixobrychus are referred to as bitterns , and are a monophyletic group within the Ardeidae .