Robuta

https://bellatlas.umn.edu/taxa/index.php?taxauthid=1&taxon=638749&clid=19 Minnesota Biodiversity Atlas - Mergus serrator minnesota biodiversity atlas mergus https://www.semanticscholar.org/topic/Mergus-serrator/1977382 Mergus serrator | Semantic Scholar mergus serrator semantic scholar https://davesbirdingdiary.blogspot.com/2015/12/red-breasted-merganser-mergus-serrator.html DavesBirdingDiary: Red-Breasted Merganser ( Mergus serrator ) . The River Exe . Topsham . Devon mergus serrator the river red breasted merganser