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In Yoshi's Story, Piranha Pests simply resemble the bud of a Piranha Plant with a propeller instead of a stem or stalk. They have tongues almost as long as a Yoshi's, but instead of making eggs, they attempt to swallow the Baby Yoshi and shrink him temporarily. They can only be defeated with a Yoshi Egg.
Piranha Pests are an exotic variation of Piranha Plant indigenous to Stage 4-3, Piranha Grove. They appear to weave in and out of the many large Piranha Plants in search of food.
Mario & Luigi: Partners in Time
In Mario & Luigi: Partners in Time, Petey Piranha can spit out Piranha Pests. These plants use their long tongues to swing on a ? Block, trying to slam into Mario or Luigi. If they're hit with a hammer a few times, they'll be defeated.
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