A duck's quack does indeed Echo but it is just hard to hear it because, the echo would sound just like the duck's quack.
A wolf's howl doesn't have an echo because of the frequency. Also a duck's quack doesn't echo (Actually a duck's quack will echo. Google Mythbusters - they did research on this.)
A duck's quack does not echo
If the answer is supposed to be that a duck's quack cannot echo, that is entirely wrong.Duck quacks do echo.It is a scientific myth that a duck's quack does not echo. Research has shown that a duck's quack does echo, but it is hard to hear because it is difficult to distinguish the quack from the echo.There are several reasons why it is difficult to hear the echo:Echoes are produced after loud noises. Ducks quack very softly, so the reflected sound is difficult to hear.A reflecting surface is needed to hear an echo. Ducks tend not to live near reflecting surfaces such as cliff faces or buildings. An echo could be heard more readily if the duck quacked whilst flying past such as surface.
Quack Pack - 1996 The Late Donald Duck was released on: USA: 18 September 1996
Duck quacks do echo.It is a scientific myth that a duck's quack does not echo. Research has shown that a duck's quack does echo, but it is hard to hear because it is difficult to distinguish the quack from the echo.There are several reasons why it is difficult to hear the echo:Echoes are produced after loud noises. Ducks quack very softly, so the reflected sound is difficult to hear.A reflecting surface is needed to hear an echo. Ducks tend not to live near reflecting surfaces such as cliff faces or buildings. An echo could be heard more readily if the duck quacked whilst flying past such as surface.See the related links below for more information on the experiments conducted to prove that a duck's quack does indeed echo.
is a common myth that a ducks quack does not echo, however this is untrue. The University of Salford have proved that a ducks quack echoes by using a reverberation chamber. There are a number of explainations for why this myth has arised. One is that the echo of a ducks quack is usually too quiet to hear because they quack too quietly for the reflection of the sound to be heard. Another possible reason is that ducks don't quack near reflecting surfaces
Quack flakes
That is an urban myth. Several different researchers, and also the TV show Mythbusters, proved that a duck's quack does echo.
The purpose of a duck's beak is to allow the duck to quack. The quack sound resonates when the diaphraghm muscle contracts forcing the trapped air upwards into the oesophagus. The quacktorial gland in the beak then opens and closes to create an echo effect and therefore creating the sound we hear, commonly known as a quack. This is also why a duck's quack does not echo!
This appears to be a mutation of the urban legend "A duck's quack does not echo." Which is false, by the way. If it's a sound and it's in a place where echoes are possible, then it will echo.
There is a persistent urban legend that a duck's quack does not echo, and I suspect that's what you're thinking of.It's not true. No bird has a call that does not echo.http://www.straightdope.com/columns/read/1090/is-it-true-a-ducks-quack-wont-echo