grebe

from WordNet (r) 3.0 (2006)

grebe
    n 1: small compact-bodied almost completely aquatic bird that
         builds floating nests; similar to loons but smaller and
         with lobate rather than webbed feet

from The Collaborative International Dictionary of English v.0.48

Grebe \Grebe\ (gr[=e]b), n. [F. gr[`e]be, fr. Armor. krib comb;
   akin to kriben crest, W. crib comb, crest. So called in
   allusion to the crest of one species.] (Zool.)
   One of several swimming birds or divers, of the genus
   {Colymbus} (formerly {Podiceps}), and allied genera, found in
   the northern parts of America, Europe, and Asia. They have
   strong, sharp bills, and lobate toes.
   [1913 Webster]