How army ants' iconic mass raids evolved

(Harvard University, Department of Organismic and Evolutionary Biology) Researchers led by Harvard University and The Rockefeller University combine phylogenetic reconstructions and computational behavioral analysis to show that army ant mass raiding evolved from group raiding through the scaling effects of increasing colony size. The transition evolved tens of millions of years ago and is perfectly correlated with a massive increase in colony size.
Source: EurekAlert! - Social and Behavioral Science - Category: International Medicine & Public Health Source Type: news