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own resources (e.g., time and energy) that s/he--but typically he--can invest in further sex that may create additional offspring. In polygynous mating systems, sexual conflict means the optimization of male reproductive success by having mated with multiple females, even though the reproductive success of a polygynously mated female is thereby reduced. Such can be the case for the Guianan cock-of-the-rocks (Rupicola rupicola), whose male members spend

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