MOM rules about Beasts

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The Ministry of Magic Classification of Beasts
XXXXX-known wizard killer/impossible to train or domesticate

XXXX-Dangerous/required specialist knowledge/skilled wizard may handle.

XXX-Competent wizard should cope.

XX-Harmless, may be domesticated.

X-Boring.

You must obtain a license to own a Kneazle, Crup or Fwooper. Licenses can be obtained through the Department of Regulation and Control of Magical Creatures.

Hippogriffs must be kept a secret from Muggles. Owners are required to perform a disillusionment charm on them once a day when there are muggles around.

The Flobberworm is the only creature to be classified as "Boring".