"duckbills" in the noun sense
1. paddlefish, duckbill, Polyodon spathula
primitive fish of the Mississippi valley having a long paddle-shaped snout
2. platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus
small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet only species in the family Ornithorhynchidae
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License