Fowl or Foul? A Study of Hippogriff Brutality was a book in the Hogwarts Library. Ron Weasley checked it out to find information to help the Hippogriff Buckbeak survive his trial in 1993 and it is possible that Draco Malfoy also looked at this book regarding the same trail.
Behind the scenes
- The book title is a play on words-- fowl/foul being a homophone, with "fowl" being a domesticated bird and "foul" an adjective describing something that is offensive or undesirable.