Originally posted by Sara luvs her Tinky
...2. A duck's quack doesn't echo and no one knows why. ...
This is a popular bit of trivia, but a friend who kept ducks and lived near an alleyway assures me it is not true. They got lots of duck echos through the alley -- and lots of complaints about duck echoes, too. Possibly the researcher who came up with this wasn't sufficiently thorough?