Jellyfish (Super Mario Galaxy)
From the Super Mario Wiki, the Mario encyclopedia
Jellyfish are enemies from Super Mario Galaxy. They appear in the Deep Dark Galaxy and the Bigmouth Galaxy. They are a large, blue variant of Jammyfish. If Mario comes in contact with one, he is shocked. They can only be defeated by hitting them two times with a Koopa Shell, and give one coin when defeated. After they are attacked once, they glow green, but do not act any more aggressively.
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