How does Coppersmith move the plot forward in "Rikki-Tikki-Tavi"?

After Rikki-tikki defeats Nagaina, Coppersmith, the tailorbird, spreads the news among the garden animals. This helps resolve the story by letting them know the danger from the cobras is over. So Coppersmith moves the plot forward by telling the animals that Nagaina is dead.

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