Cave dwellers (4)

I think it could be either:

Which length description are you looking for?:

bats

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

This is the entire clue.

(Other definitions for bats that I've seen before include "Take a stab at the night creatures" , "Crazy - mammals" , "Loopy; mammals" , "Hutton and Gilligan" , "Cuckoo" .)

I've seen this clue in The Star Tribune.

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