Giant Moos are the type of Moo that have grown quite large after ingesting many Dream Stones.
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They cannot be caught with a Wind Bullet, but hitting them with one stuns them, and makes it possible to jump on them. When another enemy is thrown at a Giant Moo they explode, releasing several dream stones that they possibly ate. Variants include Giant Shield Moos and Giant Armored Moos.
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A Giant Moo, as seen in Namco x Capcom
A Giant Shield Moo, as seen in Namco x Capcom