One way insects communicate with individuals of the same species is with pheromones. Pheromones are volatile chemicals released by an organism that usually can be detected only by individuals of the same species. There are a number of different types of pheromones that insect pests use, but the most common type is the sex pheromone. Usually the females will emit a tiny amount of a chemical that attracts the male to her and increases the likelihood of mating. Because the chemical is volatile, air currents carry it. The male detects the pheromone in the air with receptors on his antennae. He then flies upwind to find the source of the pheromone, a prospective mate. The chemical compositions of pheromones for a number of pest species have been identified and can be synthesized in the laboratory. These synthetic pheromones can be used in conjunction with traps to catch male insects. Pests that are often monitored using pheromone baited traps include corn earworm, European corn borer, squash vine borer, and many more.