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Male stalked-eyed flies with extra-long stalks, which females prefer, father more sons and have more decendants--a rare case of a sexual ornament that advertises real benefits (153: 36*).
Female attractiveness is determined by the expression of a sexual ornament - the comb - which is phenotypically and genetically correlated to the number and mass of eggs females lay," ABC Science quoted co-authors Dr.
Females may prefer males that exhibit elaborate sexual ornaments, because these can be costly to produce and maintain.