Fish swim in schools partly to evade predators and partly to improve their chances foraging for food. Until now, it was thought that these groups were egalitarian structures in which all members benefited equally in food terms, regardless of their position. But a study published on Wednesday in Proceedings of the Royal Society B shows that the position of a fish in the school depends on how physically fit it is. The fittest swim at the front, where they get the pic of the best food. Sounds like human swim training to me, only our swimmers don’t get fed while swimming in the pool itself. Via guardian.co.uk.