On Sun, 26 Apr 2009 19:56:23 -0600, the infamous "SteveB" scrawled the following:
No, they don't . That's a cartoon sound.
I finally waited up one night so I could find out what was making that noise. When I heard it, I laughed out loud.
They sure made a lot of noise at 4am on a shake roof in LoCal. We had them on our roof in the middle of the night in Vista. They'd run up one side and glide down the other, skipping 10'. Very unnerving. I believe that they thought it was their jogging track or something. I never saw them catch and/or eat something from the roof, so it must have been either exercise or entertainment to them. They're cool birds. I like their machine gun sound (infrequent) but never heard them cuckoo in the couple years I paid attention to them.