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Sorry Celadon,that is simply not true. A duck's quack does produce an echo.

It's true too!

Scientists have shown that the timing & sequence of sound frequencies emitted by a duck are such that the (slower) following sounds destructively interfere with the reflected (faster) sounds, thus causing silence.

Anyone who doubts it should travel at the earliest opportunity at their own expense to their nearest duck-inhabited, cliff-bound lake and hear - or, rather, not hear - for themselves.

Ducks also know this. They almost always quack twice as they they often don't hear their own first quack.

JimC

got duck tucked under arm and will head towards the nearest mountain range!

Good Luck Helena !

An interesting aside ...

Cricketers in the hilly north of England have known of this lack-of-echo phenomenon for ages and even coined the phrase 'owt for a duck.

JimC

Re the spat between Celadon/Terry/JimC as to whether a duck's quack has or has not an echo,I would like to suggest that you contact Sir Peter Viggers,MP,who will no doubt be able to assist in answering this burning question.
I believe he has now moved from his residence taking his duck house with him.

JimC (and anybody else who thinks ducks don't produce an echo).

Google "echo duck".

Terry,
All I know is that when I crack my head on a beam in a pub which carries the inscription "Duck or Grouse", my head goes swimming!
Colin

What about the old tree falling in a forest, and the sound of one hand clapping. echos? I think not!

Also music producer Nile Rogers recording snare drums - no echos!

Ducks aren't unique (or even a valid example). tskk!

Terry !

Are you suggesting that the no-echo phenomenon is just some sort of quack theory?

JimC

The race for the fivehundreth is now afoot.