The wizarding world is home to many magical creatures and plants, some of which are familiar from folklore and myth. Giants, dragons, unicorns, boggarts, and goblins all have roles in the series, while many plants long believed to have magical properties, such as mandrake root, aconite, asphodel and wormwood, also make appearances. Within the stories, the conceit is that these creatures and their magical powers are real, but have been hidden for centuries from the non-magical world by the efforts of wizards, to the point where they have faded into folklore. In Hogwarts, some types of pets are allowed: cats, owls, rats, and toads. J.K. Rowling wrote a spin-off book about magical creatures to complement the main Harry Potter novels, titled Fantastic Beasts and Where to Find Them.