The mod adds a number of pheromone imitants, each of which will elicit a specific behavior from biters in the range of the emissions.
-Pacification, which makes biters stop all attacks and lounge around;
-Swarming, which attracts biters to the area (without triggering an attack);
-Scatter, which causes biters to flee the area;
-Frenzy, which makes the biters turn on and attack each other;
There is also an (expensive) evolution-reduction pheromone, to make the biters de-evolve themselves to a lower size class to make attack waves easier to repel.
Each pheromone has a complex chemical production tree, with full integration with Bob Chemicals if that is installed.