Robuta

https://species.wikimedia.org/wiki/Cygnus_atratus Cygnus atratus - Wikispecies cygnus atratus wikispecies https://davesbirdingdiary.blogspot.com/2019/12/black-swan-cygnus-atratus-bowling-green.html DavesBirdingDiary: Black Swan ( Cygnus atratus ) . Bowling Green Marsh . Topsham . Devon black swan cygnus atratus bowling green marsh topsham https://en-verde.blogspot.com/2011/01/el-cisne-negro-o-cygnus-atratus.html En VERDE: El cisne negro o cygnus atratus el cisne negro en verde cygnus