Christmas quacker

Santa left me a duck whistle in my stocking on Christmas Day so I went out to our local reservoir today to try it out. I didn't manage to attract any ducks ... although I did manage to get the attention of a couple of men who were fishing! 

"OH, THERE HAS TO BE SOMETHING IN THE STOCKING THAT MAKES A NOISE, said Death. OTHERWISE, WHAT IS 4:30 A.M. FOR?"
(Terry Pratchett)