Only after Rowling had finished the first book and it was set for publication did she find out that snowy owls are actually silent, which in the books Hedwig is not. She admits she made a research mistake but says that readers are free to assume that Hedwig communicates because of her magical nature.
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Facts about Harry Potter that you didn't know
RandomIn this book you'll finds some facts about Harry Potter characters that you probably didn't know. Enjoy! Disclaimer: I own nothing