Many mammals, such as dogs and cats, release __________, which can stimulate a behavioral response in another mammal of the same species.

Pheromones are chemical signals released by an animal that can affect the behavior of another animal of the same species. Therefore, the correct choice is pheromones. Hormones usually act within the body that produces them, while testosterone and androstenone are specific chemicals rather than the general term for these signals.

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