From the Super Mario Wiki
A Katakata Yarihō is a pink Shy Guy that appears in Mario vs. Donkey Kong. It is usually sleeping on a platform. Whenever Mario jumps on the same platform, the Katakata Yarihō awakes and runs toward Mario. However, if a Mini-Mario jumps onto the platform, the Katakata Yarihō will not be awoken. Whenever they get to the end of the platform, they will sit down and fall back to sleep.
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