The Collaborative International Dictionary of English v.0.48:

Whistling \Whis"tling\,
   a. & n. from Whistle, v.
   [1913 Webster]

   Whistling buoy. (Naut.) See under Buoy.

   Whistling coot (Zool.), the American black scoter.

   Whistling Dick. (Zool.)
   (a) An Australian shrike thrush (Colluricincla Selbii).
   (b) The song thrush. [Prov. Eng.]

   Whistling duck. (Zool.)
   (a) The golden-eye.
   (b) A tree duck.

   Whistling eagle (Zool.), a small Australian eagle
      (Haliastur sphenurus); -- called also whistling hawk,
      and little swamp eagle.

   Whistling plover. (Zool.)
   (a) The golden plover.
   (b) The black-bellied, or gray, plover.

   Whistling snipe (Zool.), the American woodcock.

   Whistling swan. (Zool.)
   (a) The European whooper swan; -- called also wild swan,
       and elk.
   (b) An American swan (Olor columbianus). See under Swan.


   Whistling teal (Zool.), a tree duck, as Dendrocygna
      awsuree of India.

   Whistling thrush. (Zool.)
   (a) Any one of several species of singing birds of the genus
       Myiophonus, native of Asia, Australia, and the East
       Indies. They are generally black, glossed with blue, and
       have a patch of bright blue on each shoulder. Their note
       is a loud and clear whistle.
   (b) The song thrush. [Prov. Eng.]
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Buoy \Buoy\ (bwoi or boi; 277), n. [D. boei buoy, fetter, fr.
   OF. boie, buie, chain, fetter, F. bou['e]e a buoy, from L.
   boia. "Boiae genus vinculorum tam ferreae quam ligneae."
   --Festus. So called because chained to its place.] (Naut.)
   A float; esp. a floating object moored to the bottom, to mark
   a channel or to point out the position of something beneath
   the water, as an anchor, shoal, rock, etc.
   [1913 Webster]

   Anchor buoy, a buoy attached to, or marking the position
      of, an anchor.

   Bell buoy, a large buoy on which a bell is mounted, to be
      rung by the motion of the waves.

   Breeches buoy. See under Breeches.

   Cable buoy, an empty cask employed to buoy up the cable in
      rocky anchorage.

   Can buoy, a hollow buoy made of sheet or boiler iron,
      usually conical or pear-shaped.

   Life buoy, a float intended to support persons who have
      fallen into the water, until a boat can be dispatched to
      save them.

   Nut buoy or Nun buoy, a buoy large in the middle, and
      tapering nearly to a point at each end.

   To stream the buoy, to let the anchor buoy fall by the
      ship's side into the water, before letting go the anchor.


   Whistling buoy, a buoy fitted with a whistle that is blown
      by the action of the waves.
      [1913 Webster]

WordNet (r) 3.0 (2006):

whistling buoy
    n 1: a buoy that makes a whistling noise [syn: whistle buoy,
         whistling buoy]