Baron von Zeppelins are different colored balloons with smiley faces that appear in Super Mario World 2: Yoshi's Island and Yoshi's Island DS. Barons usually carry harmful or helpful Items ranging from coins and extra lives to missiles and Needlenoses. Barons drop the item or enemy they are holding when a Yoshi goes under it (except in the case of 1-ups). Three Barons also carry crates together. They also help in the final battle against Baby Bowser by dropping Giant Eggs.
In Yoshi's Story, a similar type of species called Air Bags appear.
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