Wiggler are a species resembling large real-world caterpillars. They first appear in Super Mario World, where they are yellow and slowly moving when calm, but turn red and run angrily about quickly if jumped on. Wigglers, in all their types are easily identifiable by the characteristic flower or other plant growing from their head, which can lose their petals if Wiggler are enraged. Wigglers appear usually as enemies, but some are allies and even playable. In Super Mario World 2: Yoshi's Island, a fully grown Wiggler variant known as a Flutter makes an appearance, confirming that Wigglers are indeed caterpillars. Wigglers seem to transform into Flutters immediately (though in some cases as in Mario Power Tennis, temporarily) without undergoing through the cocoon stage as typical real-world caterpillars do.
In the Japanese version of Mario Party, Wario and Luigi say "Oh my God!" when they lose. In Western versions of the game, these voice clips were replaced with Luigi wailing in pain, and Wario saying "So ein Mist!" (German for "Darn it!").