What bird has a quack that doesn't echo loud enough to hear?

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.