Pigeon sex indicator. Although this pattern was reversed in autumn, most clutches are produced in spring, inducing an overall non-significant pattern in the direction suggested by Aristotle.

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Pigeons offer the opportunity to cover a much wider range of laying dates and thus to gain an impression of annual rhythmicity in sex ratio bias.

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This species has a coloration difference between the sexes.







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Abstract When the reproductive value of male and female offspring varies differentially, parents are predicted to adjust the sex ratio of their offspring to maximize their fitness Trivers and Willard, Science







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