A classification is given by the Department for the Regulation and Control of Magical Creatures to all known Beasts, Beings and Spirits. These offer an at-a-glance guide to the perceived dangerousness of a creature. There are five categories.
The Five Categories
- XXXXX: Known wizard killer / impossible to train or domesticate.
- XXXX: Dangerous / requires specialist knowledge / skilled wizard may handle.
- XXX: Competent wizards should cope.
- XX: Harmless / may be domesticated.
- X: Boring.
Behind the scenes
- In Fantastic Beasts and Where to Find Them, Ron Weasley adds nine "X" to Acromantula's Classification. This is a reference to Ron's fear of spiders. This may also be contributed to by Aragog's offspring almost killing them, only being saved by the chance appearance of his father's car. Ron also adds seven "X" on the pixie entry, with the additional remark of "if you're Lockhart".
- On the page that describes the classification system, a handwritten note by Ron Weasley indicates classification XXXXX is "anything Hagrid likes".
- The Golden Snidget is classified XXXX not for the difficulty in domestication or hazardous properties, but because it is an endangered species that will result in severe punishments if hunted or harmed.
- The Phoenix is classified XXXX not for aggression, but for the difficulty in domestication.
- Despite being classified XXXXX, Basilisks and Dragons can be tamed, by Parselmouths and Dragonologists, respectively, regardless of the incredibly dangerous nature of the creatures. In the latter case, however, wizards are more limited to using brute force and conditioning it via torture.