In a 2001 interview with publisher Scholastic, Rowling stated that she chose the subject of magical creatures because it was a fun topic for which she had already developed a lot of information in earlier books.
I et interview med forlaget Scholastic i 2004, fortalte Rowling, at hun valgte at skrive om magiske væsener, fordi det var et sjovt emne, som hun i forvejen havde udviklet meget information om.