South American cousin of the emu and ostrich (4)

I believe the answer is:

rhea

(Other definitions for rhea that I've seen before include "Grounded bird" , "Fast-running flightless bird" , "Titaness" , "South American flightless bird - mother of Zeus" , "Ostrich-like bird - satellite of Saturn" .)

I've seen this clue in The Times.

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