- merganser, fish duck, sawbill, sheldrake - large crested fish-eating diving duck having a slender hooked bill with serrated edges
--1 is a kind of sea duck
--1 is a member of Mergus, genus Mergus
--1 has particulars:goosander, Mergus merganser; American merganser, Mergus merganser americanus; red-breasted merganser, Mergus serrator; smew, Mergus albellus; hooded merganser, hooded sheldrake, Lophodytes cucullatus