Like Olympic cyclists, fish expend less effort when swimming in tight groups than when alone. The finding could explain why some species evolved to move in schools. Like Olympic cyclists, fish expend less effort when swimming in tight groups than when alone. The finding could explain why some species evolved to move in schools. Fish and Other Marine Life, Animal Behavior, Energy Efficiency, Cycling, Road, Research, your-feed-science, your-feed-animals, PLoS Biology (Journal), Yangfan Zhang NYT > Science