The Collaborative International Dictionary of English v.0.48:

Skunkhead \Skunk"head`\, n. (Zool.)
   (a) The surf duck.
   (b) A duck (Camptolaimus Labradorus) which formerly
       inhabited the Atlantic coast of New England. It is now
       supposed to be extinct. Called also Labrador duck, and
       pied duck.
       [1913 Webster]