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My girlfriend at the time would make a pathetic whistle to him when she left the house. After the first day, he added a perfect copy of her imperfect whistle to his repertoire. As happens with girlfriends, she left the next Christmas.
By now it must be two or three generations of mocking birds later, but there are several I hear who still use the ex-girlfriend's pathetic whistle in their songs. The women come and go, but the song remains.