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Zebrafish are exceptionally good synchronised swimmers, forming tight schools that contain hundreds of individuals. Physicists have shown how the fish stay together even as they swim faster to avoid a predator – and they do so by subconsciously performing the kind of weighted averages calculation familiar to high-school mathematics students.
Small fishes tend to swim in schools. Sticking together decreases the risk of any individual fish being killed by predators, and biologists say a school of fish can have more foraging success because …
source: newscientist.com