Twirlip

Twirlips are a new species of enemy appearing in the game Super Mario Galaxy 2. At first glance, they appear as white bud shaped creatures with two beady eyes and a smiley face. However, they will turn into a pink flower with a yellow center and spin around the area like a drill.

In their flower form, Twirlips can only be damaged by stomping on their heads. In their bud form, Mario or Luigi can use any attack method to defeat them. Yoshi can also eat a Twirlip, but only while it's in bud form. They appear in a few galaxies, but most notably in the Spin-Dig Galaxy. They are also fought on some Bonus Planets.