From the Super Mario Wiki
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Crafty Cats are balloons designed after cats in Yoshi's Crafted World. Two of them are found in the level Mousers and Magnets, each occupying their own room with Little Mousers in the ceiling. If Yoshi ground pounds the air pump connected to the Crafty Cat, the cat will inflate, scaring the Little Mousers off the ceiling. The Crafty Cat then starts to deflate.