https://whyevolutionistrue.wordpress.com/2017/05/08/an-evolutionary-biologist-misrepresents-sexual-selection/
The first, which Darwin called "the law of battle," was correct: males are larger and have weapons or features that enable them to compete for females, as when elephant seals or elk fight it out for mates. The ultimate cause of this difference, which I've described before, is the difference in gamete size between the sexes (sperm vs eggs), which ultimately leads to females being a scarce resource for which males have to compete
_- Steve
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