A duck's quack does not echo. Does anyone know why?

"a duck's quack does echo, but it is quite hard to hear the echo because of the quality of the quack sound. A sound that fades in and out (like a duck quack) makes an echo which can become mixed up with the original sound being made. This means it is hard to distinguish one from the other."

good question though since I am sure a lot of people think the same thing :)

Note well, you won't find this claim made in any scientific journal or textbook. You will find it repeated in questionable sources such as email trivia lists and fruit drink bottle caps -- reason enough to be skeptical right there.

The obvious question -- and the one never answered by those who tout this absurd factoid, of course -- is, why wouldn't a duck's quack echo? What could there possibly be about the sound a duck makes that would uniquely exempt it from physical laws that apply to all other such sounds, e.g., a dog's bark, a cat's meow, or a lamb's bleat?

The answer is: nothing.

The claim that a duck's quack doesn't echo is empirically dis proven here.

Quack Echo

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RE:

A duck's quack does not echo. Does anyone know why?

Hate to break it to you, but not true. I have heard the echo of a duck's quack myself.

Quack

No sound echos on its own. Echo come from the environment. Conditions have to be such that will allow the sound to bounce of certain objects repeatedly and return to the sound sender.

It does. This myth was dismissed on Mythbusters a good while ago.

This is not true. Myth Busters did a show about it.