Pheromones are chemicals released by one animal that are detected by another animal and bring about a reproductive change in that animal. Dependency on pheromones varies with species and is found in mammals but not birds. Pheromones from males can reduce the age at which puberty occurs and induce estrus in females. Likewise pheromones from females communicate to the male that the female is receptive for mating. Pheromones can also influence reproductive behavior within the same sex.

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