Dear Mr Mocking Bird or perhaps Lady Mocker,
Your parents must be so proud. The fact that you have mastered an impersonation of a car alarm is a real testament of your skills. However when you show off your fowl linguistics at 2am outside our bedroom window, you're cutting into ME time.
You see I need my rest, as I have critical cat business that starts around 4am. Also when you wake my Mother at 2am she is very crabby when I wake her again at 4:30.
This is not acceptable, please cease and desist immediately. If you continue down this path I will be forced to engage an Attorney At Claw.
Not That Respectfully Yours,
Finny Da Floof