system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] What classifies a creature as being 'magical', and why does the Ministry of Magic bother to hide harmless creatures like flobberworms from Muggles?
gpt
Magic is something that can be detected, a creature is magical if it has magic, which is known because it either exhibits clearly magical traits or is otherwise detected as having magic.

Magical creatures are kept apart because of the statute of secrecy primarily, and protection of muggles somewhat.

Imagine what would happen if they weren't kept separate and a magical disease made the leap across from one to muggle creatures and due to them not being kept separate or monitored at all it went widespread? It'd be havoc, the statute would be screwed pretty much due to the whole you need magic to counter magic thing that is so prevalent within the setting.