I would try that but DH would not want me disturbing the neighbors. He's very sensitive about that, probably because I am so easily disturbed.
I am dealing with baby mockingbirds, which are a different animal from adult mockingbirds. The sound of the adults is fine, though they are welcome to poop the seeds of trash plants in someone else's yard. We did get a mechanical owl and DH set it up near baby mockingbird's place and it did seem to shut the brat up. DH said that he didn't hear from it but I was not out. I was surprised that the baby (really a 'teenager') was smart enough to recognize a predator. DH did not hear a mockingbird this morning, though I went out with my protective equipment (iPod with noise-cancelling headphones). It is time for baby mockingbird to grow up.