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 Penny Press, the Sydney Morning Herald, the Universal, the USA Today, the LA Times, The Star Tribune and The Sun.

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