The Onions are the nests of the Pikmin. Olimar named them so because of their resemblance to a vegetable native to his home planet. These bulbous plant-hives have brightly colored bodies with a black and white band across the midsection. Three stilt-like legs suspend the Onions out of the reach of hungry predators, and provide access to the inside for Pikmin.
During the daytime, Pikmin hunt and bring food, such as pellets or slain beasts, to the Onion, which in turn produces new Pikmin seeds. If there are fewer than 100 Pikmin on the field, the seeds are ejected and take root in the ground; if not, they are stored inside the Onion. When night falls and all the Pikmin have returned, the Onion folds its legs and lifts off from the ground, where it hovers until daybreak.