Experiments with ant species (Iridomyrmex humilis, Linepithema humile and Lasius niger) showed that there is an indirect communication between individuals through pheromones . The ants, on their way from the nest to the food source and vice versa, deposit pheromones in the soil forming a trail, which are able to smell the rest of the components of the colony. The greater the concentration on a path the greater the probability that an ant will follow that path. To test this fact, double-bridge experiments were designed, changing the relationship (𝑟 = 𝑙𝑙/𝑙𝑠 ) between the lengths of branches, being 𝑙𝑙 and 𝑙𝑠 are the lengths of the long and short branches, respectively. In the first experiment the nest was connected with the food source using two branches of same length, while in the second experiment the two branches were of different length. Fig.1 Bridge experiments: a) Branches of same length, r=1. b) Branches of different length, r= 2. In the first case the re...