At LEEEIS: Predator-prey coevolution is based on complex mechanisms that generate an arms race between the species in interaction, influenced by the specificity of their relationship and the environmental pressures experienced by them. Defense strategies and counter-strategies are a classic coevolution example, and allows us to understand how environmental selection pressures shaped these behaviors. Army ants of Eciton genus use group hunting to attack mainly other ant species to obtain food, going out in thousands and collecting immature and adults from their prey nests. Each species specializes in a few species of prey. Ants that are frequently preyed could then evolve specific defense strategies against the species that prey on them. Thus, predated ants can show strategies to reduce the impact of predation under their colony, fleeing quickly with their offspring or obstructing the entrance of the nest to prevent the
predator species from entering. Our study aims to identify the ants' species that are frequently predated by ants of Eciton genus species, which are capable of detecting army ants in the nest region, whether this detection occurs through direct contact with the cuticle or contact with released pheromones, and what is the defense strategy adopted from that first contact.