From the Super Mario Wiki, the Mario encyclopedia
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Like ordinary bubbles, a Yoshi can pop a ? Bubble by simply throwing a Yoshi Egg at it or by touching it about 15 to 30 times. When the Yoshi bumps into it once, it simply gets knocked around, without popping. These objects occasionally just float or move around the area of the level above the ground. ? Bubbles can hide walking coins, a Shy Guy, a melon in a parachute, a Surprise Ball, or a Heart Fruit.
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