Fish Bone



Fishbones are swimming skeletons of fish in Super Mario World. They swim in a straight line heading to the left and cannot be defeated. Yoshi can't eat them and of course fireballs don't work against the undead. They swim slowly so avoiding them is easy.

They could be dead forms of Cheep-Cheeps and/or Blurps, perhaps even Honens, which were only seen in Super Mario Land (Honens are dead Torions, which are found in the same game).

They're possibly related to Jean de Fillet from Super Mario World 2: Yoshi's Island.