Crossword Genius

South American bird resembling a small ostrich (4)

Ross

I believe the answer is:

rhea

(Other definitions for rhea that I've seen before include "Titaness" , "S. Amer. flightless bird" , "Fast runner" , "nonflyer" , "Flightless bird -- satellite of Saturn" .)

I've seen this clue in The Wall Street Journal.
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