duckbilled platypus

from WordNet (r) 3.0 (2006)

duckbilled platypus
    n 1: small densely furred aquatic monotreme of Australia and
         Tasmania having a broad bill and tail and webbed feet; only
         species in the family Ornithorhynchidae [syn: {platypus},
         {duckbill}, {duckbilled platypus}, {duck-billed platypus},
         {Ornithorhynchus anatinus}]

from The Collaborative International Dictionary of English v.0.48

Duck-billed platypus \Duck"-billed` plat"y*pus\, a.
   same as {Duck Mole}, under {Duck}..

   Syn: duck mole, duckbill, duck-bill platypus, platypus. [PJC]