A chemical produced by one animal that is usually only detectable by another animal of the same species is called a

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Pheromones are chemicals produced by animals that influence the behavior or physiology of others of the same species, often functioning in communication. Hormones act within the body of an individual, neurotransmitters are involved in nerve signal transmission, subliminal suggestions are a psychological concept, and "releaser" is not a specific term for a chemical signal in this context.

A Chemical Produced by One Animal That Is Usually Only