The urge to aggress is innate, but to manifest itself it must also be released by an appropriate stimulus. This idea was promoted by the:

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Ethologists, who study animal behavior in natural environments, have promoted the idea that the urge to aggress is innate but requires an appropriate stimulus to manifest. They believe that aggression, like other behaviors, has evolved because it has survival value.

The Urge to Aggress Is Innate, but to Manifest Itself