Photo: “J. Rowling: Thank you for that beautiful painting. It really moved me! They're [Newt and Harry] two characters that mean so much to me.” Harry potter and fantastic beast and qhwre to find them crossover art
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.
Newt Scamander Wand / Harry Potter / FANTASTIC BEASTS