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Collective animal behaviour occurs at nearly every biological size scale, from single-celled organisms to the largest animals on earth. It has long been known that models with simple interaction rules can reproduce qualitative features of this complex behaviour. But determining whether these models accurately capture the biology requires data from real animals, which has historically been difficult to obtain. Here, we report three-dimensional, time-resolved measurements of the positions,doi:10.1038/srep01073 pmid:23323215 pmcid:PMC3545223 fatcat:x6h4gnlcvbdh3nr3dsx34uilyy