Why does Clyde Stovetop Tea Kettle make a rattling sound? Why does Clyde Stovetop Tea Kettle make a rattling sound?

Why does Clyde Stovetop Tea Kettle make a rattling sound?

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To make the Clyde Kettle sing, there's a marble trapped in the spout which vibrates against a reed to create the two-tone whistle. This marble is free to move around the spout and may make a slight rattling sound.