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Just an FYI for all. What is described by FOMOGO is a "mating call" of sorts. I had one years ago the would go to town on my metal eaves troughs at zero-daylight-thirty. Makes a heck of a racket, and can also be heard all over the neighborhood. I did a bit of research to learn that it was a method employed by the male in an effort to attract females. They will usually find a phone pole or tree that resonates quite well, but in my case, and the other two mentioned here, they chose a metallic object that they found suitable.
Roger