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Species spanning the animal kingdom have evolved extravagant and costlyornaments to attract mating partners. Zahavi's handicap principle offers anelegant explanation for this: ornaments signal individual quality, and must becostly to ensure honest signalling, making mate selection more efficient. Herewe incorporate the assumptions of the handicap principle into a mathematicalmodel and show that they are sufficient to explain the heretofore puzzlingobservation of bimodally distributed ornament sizes in a variety of species.

Handicap principle implies emergence of dimorphic mating displays