Substance secreted and released by animal for detection and response by another of the same species Pheromones are semiochemicals. This means that they convey information from one organism to another.
Pheromones are a sub-category of semiochemicals.
The information that they convey may be of several types. The most commonly used by man for Integrated Pest Management are Sex Pheromones and Aggregation Pheromones. Sex pheromones are typically released by the female to alert males to her presence, and assist them in finding her. Generally, pheromones are volatile substances. This means that the chemicals they consist of have a low molecular weight, and will evaporate into the air very readily.