Ants are social insects and the Solenopsis invicta species —known as the fire ant— is no exception. The social interactions of this invasive insect, which comes from South America, are framed within the context of the theory of Active Matter, which would explain the ants’ group behaviour as a reaction to the intrinsic mechanisms in the system. This is one of the conclusions of an article published in the journal Science Advances by two University of Barcelona researchers along with Guillermo Goldsztein, professor in the School of Mathematics.