Lophodytes cucullatus

from WordNet (r) 3.0 (2006)

Lophodytes cucullatus
    n 1: small North American duck with a high circular crest on the
         male's head [syn: {hooded merganser}, {hooded sheldrake},
         {Lophodytes cucullatus}]

from The Collaborative International Dictionary of English v.0.48

Merganser \Mer*gan"ser\, n. [Sp. merg['a]nsar, fr. mergo a diver
   (L. mergus, fr. mergere to dip, dive) + ['a]nsar goose, L.
   anser.] (Zool.)
   Any bird of the genus {Mergus} ({Merganser}), and allied
   genera of the subfamily Merginae. They are allied to the
   ducks, but have a sharply serrated bill, eat fish, and dive
   for food. Also called {fish duck}.
   [1913 Webster +PJC]

   Note: The red-breasted merganser ({Merganser serrator})
         inhabits both hemispheres. It is called also {sawbill},
         {harle}, and {sheldrake}. The American merganser
         ({Merganser Americanus}.) and the hooded merganser
         ({Lophodytes cucullatus}) are well-known species.

   {White merganser}, the smew or white nun.
      [1913 Webster]