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Extravagant sexual ornaments are sometimes restricted to individuals of one sex, most often males, being the result of intrasexual competition or intersexual mate preferences (Darwin, 1871).
Parasites, sexual ornaments, and mate choice in the barn swallow.
If this proves to be a general feature of allometric relationships - that allometry shape is largely invariant - then this may afford fresh insight into questions concerning how and when costly secondary sexual ornaments evolve.
Specifically, lineages capable of generating sigmoidal growth patterns may be more likely to evolve costly male secondary sexual ornaments than similar lineages lacking this developmental potential.
Female preference for apparently symmetrical male sexual ornaments in the barn swallow Hirundo rustica.
Sexual ornaments size and the cost of fluctuating asymmetry.
It claims that male sexual ornaments have evolved to indicate heritable male quality (Zahavi 1975).
In this and the accompanying paper (Pomiankowski and Iwasa 1993), we have defined the conditions for the evolution of preferences for multiple sexual ornaments. Our treatment has separately analyzed Fisher's runaway and the handicap process.

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