Three stilt-like legs suspend the Onions out of the reach of hungry predators and provide access to the inside for Pikmin. There are concentric circles on the ground in the Onion landing spots in each area, which are never referred to in-game. On the top, there is a big flower, resembling the flowers that Pikmin have. These bulbous plant-hives have brightly colored bodies with a black and white band across the midsection. In Pikmin 3, if an Onion is discovered, their Pikmin can also be accommodated by the bigger Onion at the landing site before they fuse the at end of the day. It also appears that the Onions in Pikmin 3 are much more malleable than their Pikmin and Pikmin 2 counterparts in regards to which Pikmin species they will hold. Some Onions require light, as in Pikmin 3: the Yellow Onion did not activate until a nearby light source was turned on, even when approached. In Pikmin 3, all discovered onions merge at nighttime after they are discovered, and become a single, universal Onion, greatly simplifying the management of Pikmin types at the beginning of each day. As of Pikmin 2, subterranean species such as Purple Pikmin, White Pikmin, and Bulbmin do not have Onions.

There are five known types of Onion nests, each with unique coloration corresponding to either Red, Yellow, Blue, Rock, and Winged Pikmin, and only one of each has ever been seen. Onions are the large, round life forms that act as nests for the Pikmin. If you were looking for the treasure in the Perplexing Pool, see Onion Replica. This article is currently a featured article, as of June 25, 2014.

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