Extinct birds (5)

I think it could be either:

Which length description are you looking for?:

dodos

'extinct birds' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for dodos that I've seen before include "they're no more" , "Extinct birds of Mauritius" , "Extinct flightless birds" , "They never got up" .)

I've seen this clue in The Star Tribune, the LA Times, the USA Today, the Sydney Morning Herald, The Sun, the Penny Press and the Universal.

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