- Mergus, genus Mergus - mergansers
--1 is a kind of bird genus
--1 is a member of Merginae, subfamily Merginae
--1 has members:merganser, fish duck, sawbill, sheldrake; goosander, Mergus merganser; American merganser, Mergus merganser americanus; red-breasted merganser, Mergus serrator; smew, Mergus albellus