Crossword Genius

Wild hares resembling ostriches! (5)

Ross

I believe the answer is:

rheas

I'm a little stuck... Click here to teach me more about this clue!

'ostriches' is the definition.
The answer and definition can be both animals as well as being plural nouns.
Maybe you can see an association between them that I can't see?

'wild hares' is the wordplay.
'wild' indicates an anagram.
'hares' anagrammed gives 'RHEAS'.

'resembling' acts as a link.

Can you help me to learn more?

(Other definitions for rheas that I've seen before include "these birds won't fly" , "Ostrich-like birds" , "Flightless birds" .)

I've seen this clue in the Evening Standard.
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