Bulb Yoshi

Bulb Yoshi is one of Yoshi's power-ups in the game Super Mario Galaxy 2 along with Dash Yoshi and Blimp Yoshi. Yoshi becomes Bulb Yoshi whenever he eats a Bulb Berry. When this happens, he turns yellow and glows.

While glowing, Yoshi will be surrounded in a circle of light which can reveal passages that are not normally seen. However, the effects of this power-up are only temporary, so he must eat another nearby Bulb Berry to prolong it. Bulb Yoshi runs out of glow when the music dies down. Bulb Yoshi can also use launch stars and enter pipes.

Trivia

 * The Glowing Baby Yoshi of New Super Mario Bros. U has similar functions.