I'm meeting her at the corner of Vermont and Franklin the northwest corner, in case you're interested.

Since most ants live on the ground, they use the soil surface to leave pheromone trails that may be followed by other ants.

In ant species with queen castes, when the dominant queen stops producing a specific pheromone, workers begin to raise new queens in the colony.

The use of pheromones as chemical signals is more developed in ants, such as the red harvester ant, than in other hymenopteran groups.

Other caterpillars have evolved from ant loving to ant eating these myrmecophagous caterpillars secrete a pheromone that makes the ants act as if the caterpillar is one of their own larvae.