We are occasionally asked about what sound a platypus makes, and we have to confess, we are at a bit of a loss.
Despite its duckbilled visage, we are pretty certain it does not quack.
Intense research (google) revealed the following: The platypus makes a variety of sounds. When they are disturbed, they may make soft growling sounds, like that of a puppy.
The best we found was this:
Or, of course, there is always this: