Little Skull Mouser
From the Super Mario Wiki
A Little Skull Mouser is a creature a lot like a Little Mouser, but has the skull of an unknown creature on its head. It is known to jump around aimlessly. It is found only in Super Mario World 2: Yoshi's Island. Jumping on theirs heads will destroy the skull and revert them back to normal Little Mousers. Unlike the Mousers, they don't seem interested in stealing a Yoshi Egg until their skulls are destroyed. Surprisingly, a ground pound will not immediately kill them.
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