Well, the buzzards have taken off for other trees. We succeeded in discouraging them by sitting on the deck, drinking scotch, talking and listening to loud old rock and roll music. They evidently don't like Led Zepplin or Chicago. Also a few wacks from a pellet gun sort of helped them to get the hint.
I'm feeling better now that I have learned that the plague of frogs wasn't just in my office. On the other hand.....maybe I should be worried about the entire town?