Pheromones are chemicals that are released by an organism. On detecting these pheromones the biology and behaviour of another organism, usually a member of the same species, is affected.
For example, the female Vapourer Moth (Orgyia antiqua) is flightless and cannot search for a mate. This means that males must search for the females. In order to make themselves easier to find the female moths produce a pheromone. The males detect this pheromone using long feathery antennae and follow the pheromone trail to the female moth.
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