Next, I set out roach motels glue traps baited with a pheromone melange in each of these locations.

If a hornet is killed near a nest it may release pheromone which can cause the other hornets to attack.

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.

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.