What Is the Sexy Son Hypothesis? Sexual Selection in Birds
- 演化之聲
- Mar 14
- 4 min read
The sexy son hypothesis may sound like a dramatic phrase, yet it represents an important concept in evolutionary biology. It was proposed to explain why certain species evolve socially polygynous mating systems. The central idea is relatively intuitive: under some circumstances, a female may benefit from mating with a male that already has a partner rather than choosing an unmated male. Even though such a decision may reduce her immediate reproductive success, the long-term outcome may increase her overall evolutionary fitness. This occurs because her sons may inherit their father's tendency to attract multiple mates, allowing them to produce more offspring in the next generation and thereby increasing the number of grandchildren she ultimately leaves behind. The hypothesis was introduced in 1979 by Patrick J. Weatherhead and Raleigh J. Robertson, who attempted to explain why some female birds choose to associate with already-paired males and become secondary mates rather than pairing with a single unmated male.
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