Pretty Polly, Polly, Polly, Polly, Polly ⃛

Jeremy J. D. Greenwood
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Jeremy J. D. Greenwood: the British Trust for Ornithology

Nature, 1997, vol. 389, issue 6650, 442-442

Abstract: Some birds can skew the ratio of male to female offspring that they produce, and the most extreme example of this has just been reported for the Eclectus parrot (Eclectus roratus). One female produced 20 sons in succession, followed by a run of 13 daughters. But it's still a mystery how — and why — these ratios are produced.

Date: 1997
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DOI: 10.1038/38900

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