Yoob is a boss in the Mario & Luigi series, first appearing in the Nintendo DS game . Yoob is a giant pink and green Yoshi that was Shroobified during the Shroob Invasion of the Mushroom Kingdom. Yoob's egg mysteriously appeared on the Yoshi's native island, and became a tourist attraction. Upon hatching, it was revealed that Yoob was created by the Shroobs to eat all Yoshis and convert them to Yoobs, hence its large appearance.