Smews (Mergellus) is a genus of bird (Aves) in the family Anatidae (Ducks, Geese, and Waterfowl).
Mergellus albellus
Anser
Branta
Aythya
Plectropterus
Amazonetta
Rhodonessa
Chloephaga
Marmaronetta
Salvadorina
Thalassornis
Stictonetta
Pteronetta
Malacorhynchus
Nettapus
Hymenolaimus
Coscoroba
Chenonetta
Speculanas
Sibirionetta
Cyanochen
Oressochen
Lophonetta
Callonetta
Merganetta
Heteronetta
Tachyeres
Cereopsis
Sarkidiornis
Asarcornis
Alopochen
Bucephala
Mergus
Histrionicus
Lophodytes
Camptorhynchus
Clangula
Melanitta
Mergellus
Polysticta
Oxyura
Somateria
Dendrocygna