Cheerios is a brand of cereal manufactured by General Mills in the United States, consisting of pulverized oats in the shape of a solid torus. In some countries, including the United Kingdom, Cheerios is marketed by Cereal Partners under the Nestlé brand; in Australia and New Zealand, Cheerios is sold as an Uncle Tobys product. It was first manufactured in 1941 as CheeriOats.

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Fire ant rafts form because of the Cheerios effect, study concludes. Fire ants will change shape of the raft to reduce drag and adapt to fluid flows.