Unaware of how bats hunt (2,3,4)

I believe the answer is:

in the dark

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

I cannot understand how the rest of the clue works.

(Other definitions for in the dark that I've seen before include "Ignorant, unaware" , "during the night?" , "Told nothing" , "Not knowing" , "Lacking information" .)

I've seen this clue in The Irish Times.

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