From the Super Mario Wiki
A Flying Snifit is a non-damagable enemy in the Nintendo DS game Mario & Luigi: Bowser's Inside Story and its 3DS remake. They are blue Snifits with a pair of butterfly wings, and can only be seen in Bumpsy Plains. They aid Flifits if they've been wilted by Bowser's Vacuum by watering them, thus restoring their normal strength in the process. Mario and Luigi never see these enemies due to not having the ability to wilt Flifits.
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