From the Super Mario Wiki
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Pinheads are a type of creature appearing in the game Super Mario Galaxy 2. They appear as bowling pin-shaped enemies with two beady eyes, a red squiggly mouth, and a yellow antenna. These creatures are very rare, only appearing in two galaxies: Boulder Bowl Galaxy and Melty Monster Galaxy. They can only be defeated by Rock Mario, and when they see the plumber turning into a rolling boulder, they tremble desperately. However, if Mario comes close to them, they squeal and hide underground until he moves away.
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