Nocturnal creature (3)

I think it could be either:

Which length description are you looking for?:

10*

owl

'nocturnal creature' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for owl that I've seen before include "Nightbird" , "Traditionally wise bird" , "Bird of prey with front-facing eyes" , "Wise old bird" , "Athena's bird" .)

I've seen this clue in The Mirror.

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