Nothing rhymes with buffing... start again... Ahem...
We all know that Orange does not have a word that rhymes with it(apart from the ones that do).
re Ducks
The Quack you hear IS the echo.
Ducks emit silent sonic rings that enable them to see things in the same way Primates do. The feedback they get (a bit like an underwater nuculear submarine) allows them to fly high enough to do lots of things.
hth