What is the function of a rubber duck? What is the function of a rubber duck? If you're a muggle (unlike me #wizard) answer this.

To be freaking awesome :D

The function of a rubber duck is to entertain young children so they will enjoy bath time. They are also cute! Hope you like my answer

It's cute and it makes squeaky sounds. Why are witches and other such magical things so stubbornly practical? -_-

I think they are used because they think ducks are cute? They use them in baths... Silly muggles.