Four stars down to three because this book could have been so much more than it is. Only 95 pages. Only a paragraph or two for each creature. Rowling has so much more creativity to give and share, and so much more than that in her writing notes alone.
Also, structure like a textbook would have been nice, such as questions for discussion and research. I was also surprised at the lack at interlinking in the Kindle edition--one of the major benefits of an ebook, barely used at all!