Rowling actually wrote and published a version of "Fantastic Beasts" for us muggles to read. The book is an encyclopedia of creatures, with a foreword from Dumbledore himself. The niffler and bowtruckle are definitely in it.
English Poster For The Film Revenge Of The Creature
Discover which creature from 'Fantastic Beasts and Where to Find Them' you're most like NOW!<<<I got an Occamy