The authors also convincingly demonstrate that when an animal acts altruistically, it handicaps itself -- assumes a risk or endures a sacrifice-not primarily to benefit its kin or social group but to increase its own prestige within the group and thus signal its status as a partner or rival. Finally, the Zahavis show how many forms of non-verbal interaction among humans -- tones of voice, facial expressions, body postures -- can also be explained by the Handicap Principle, and underscore the enormously important role of such behavior plays in human communication.
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