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The Biffidus is a member of a tribe-like group of Biffidus, who act as antibodies within Bowser's body, and appear to assist the parasite worm Durmite. They have round white bodies with black faces and featureless eyes. They also have red feet, and they carry shields and spears. During the events of Mario & Luigi: Bowser's Inside Story, Bowser ate a huge carrot which, unknown to him at the time, contained Durmite. The Biffidus assist Durmite in battle by trying to jab Mario or Luigi with their spears. However, after taking much damage, Durmite will eat the Biffidus, then regurgitate their spears at Mario or Luigi, which they must jump over. In the battle with Durmite X, Biffidus Xs appear instead of regular Biffiduses.
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