Dear Librarian: New York Public Library's Quirkiest Inquiries

    ‘15 June, 1967, [Question:] What is the natural enemy of a duck?
   [Librarian:] What do you mean?
   [Reply:] Well, a whole flight of them landed in my pool and I have waved a broom at them but all they do is look at me and quack. I thought I could introduce the natural enemy into the pool area.’