There are many questions like this raised so far, and many others will pop up in the future. Unfortunately, not every question related to Harry Potter novels can be answered. Why? The answer is very simple:
In asking those questions we are usuing the logic of the real life. While HP is a fantasy novel and this logic does not apply there. I don't mean to discourage others from exploring and exercising the art of reasoning and the power of arguments in anwering questions, but simply try to ahve fun with Potter. Thats what He was created for.
Gender: Female Location: Lodged up more than one ass
I know Harry Potter is just a book and all of those characters are fictional as well as anything happening in the book/movie BUT you would've thought that Rowling would've came up with something for this error.