Pheromone
A pheromone is any chemical produced by a living organism that transmits a message to other members of the same species. There are alarm pheromones, food trail pheromones, sex pheromones, and many others. Their use among insects has been particularly well documented, although many vertebrates also communicate using pheromones. Their use by humans is controversial.
Insect pheromones of pest species, such as the beetles and the gypsy moth, can be used to trap them or to create confusion so that the pests do not lay eggs on crops.
In mammals and reptiles, pheromones may be detected by the vomeronasal organ, or Jacobson's organ, which lies between the nose and mouth, although some are detected by regular olfactory membranes.
Insect pheromones of pest species, such as the beetles and the gypsy moth, can be used to trap them or to create confusion so that the pests do not lay eggs on crops.
In mammals and reptiles, pheromones may be detected by the vomeronasal organ, or Jacobson's organ, which lies between the nose and mouth, although some are detected by regular olfactory membranes.
Source: wikipedia, under GFDL
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