American diplomats injured in Cuba in 2016 reported hearing strange noises before their symptoms set in. Apparently they heard crickets:
[W]hen the biologist Alexander Stubbs heard a recording, uploaded by the Associated Press, he heard not mechanical bugs, but biological ones. He realized that the noise sounded like the insects he used to hear while doing fieldwork in the Caribbean.
Together with Fernando Montealegre-Z, an expert on entomological acoustics, Stubbs scoured an online database of insect recordings. As first reported by Carl Zimmer in The New York Times, they found that one species—the Indies short-tailed cricket—makes a call that’s indistinguishable from the enigmatic Cuban recording. The duo have written a paper that describes their findings and are set to submit it to a journal for formal peer review.
That's interesting, but not the point. There was some speculation that the diplomats' injuries came from a microwave weapon, but that hypothesis didn't hold up. Last month, some evidence appeared that it may have been a sonic weapon after all. But probably not crickets.