Flying mammals (4)

I believe the answer is:

bats

'flying mammals' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for bats that I've seen before include "Clubs; flying mammals" , "out to lunch" , "bananas" , "Those striking" , "Night-flying creatures" .)

I've seen this clue in The Star Tribune, the Sydney Morning Herald, the Evening Standard, The Mirror and the Newsday.

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