Every morning shortly after dawn, a big black bird does a woodpecker imitation on my metal roof vent. Of course, he picks the one that vents the bathrooms, so the racket reverberates all over the house...and wakes the dead...that'd be me... He pecks, looks around, repeats a few times then moves on to the next house. Suspect he's marking his territory.
I'm in the city, so the obvious solution involving lead projectiles is not an option.
How do I scare him off? I'm not above killing the little pecker. A sound-activated stun gun sounds like a fun project. Suggestions?