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Pheromone
http://en.wikipedia.org/wiki/Pheromone
A pheromone (from Greek φέρω phero "to bear" + ‘ορμόνη "hormone") is a chemical that triggers a natural behavioral response in another member of the same species. There are alarm pheromones, food trail pheromones, sex pheromones, and many others that affect behavior or physiology. Their use among insects has been particularly well documented, although many vertebrates and plants also communicate using pheromones
Fanning honeybee exposes Nasonov gland (white-at tip of abdomen) releasing pheromone to entice swarm into an empty hive
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