Crossword Genius

They may emit as many as 200 beeps per second

Ross

I believe the answer is:

bats

(Other definitions for bats that I've seen before include "Hutton and Gilligan" , "out to lunch" , "Loopy; mammals" , "Clubs; flying mammals" , "Crazy; night-fliers" .)

I've seen this clue in The New York Times.
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