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perspective, aggression is regarded as "an ensemble of mechanisms formed during the course of evolution in order to assert oneself, relatives, or friends against others, to gain or to defend resources (ultimate causes) by harmful damaging means. These mechanisms are often motivated by emotions such as fear, frustration, anger, stress, dominance or pleasure (proximate causes). Sometimes aggressive behavior serves as a stress relief or a subjective feeling of power." Predatory or defensive behavior between members

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