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 this form, they can be damaged, but only by jumping on their yellow center. They cannot be eaten by Yoshi in this form though. Mario or Luigi can only defeat these in their bud form. They appear in a few galaxies, but most notably in the Spin-Dig Galaxy. They are also fought on some Bonus Planets.