At the site we were staying at on our last night near Verona, there were these mysterious berds in the tree directly above our pikey van that sounded like intermitent electrical interference that would go on for up to 15 minutes at a time.

Bit like those rancid magpies only werse.
Haven't got the foggiest what they were, but I tell you, if I'd 'ad a gun they'd have been on the BBQ that night.
