Study Shows Caterpillars Mimic Ant Rhythms to Infiltrate Colonies

A new study reveals that certain butterfly caterpillars have evolved a sophisticated rhythmic mimicry to deceive ants into adopting them, using vibrations that closely match the hosts' communication patterns. Researchers from the University of Warwick, the University of Turin and the Forest Research Institute in Poland analyzed recordings from nine species of gossamer-winged butterflies in the family Lycaenidae and two ant species, finding that the most ant-dependent caterpillars produce a complex beat structure known as double meter. The findings, published February 25 in the Annals of the New York Academy of Sciences, highlight how these larvae infiltrate ant colonies for food and protection, often at the hosts' expense.

The research focused on caterpillars collected from wild sites in northern Italy, including species like Plebejus argus and Phengaris alcon, which rely entirely on ants for survival. Using hypersensitive microphones, the scientists captured thousands of vibrational signals produced by rubbing body parts against surfaces, a method ants employ to coordinate activities such as rescues and social interactions. All studied insects generated a steady,...