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This breeding system may have evolved as a result of kin selection, but in addition it has been shown by Wiley and Rabenold ( 1984 ) that the males ' behaviour of " queueing " for the status of breeding male can be an evolutionarily stable strategy provided some plausible conditions are met.
Formally, the situation has the characteristics of a prisoner's dilemma game that is played repeatedly between the same partners, and in this case " defection "-jumping the queue-would not be advantageous.

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