Darwin argued that the large physical size of males was a physical specialization to aid in competition between males for females.He called this theory:

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Darwin's theory of sexual selection explains how certain physical traits evolve within a species as a result of competition for mates. In this case, the larger size of males is a trait that is favored by females, as it indicates strength and fitness. As a result, males who are larger and more physically imposing are more likely to successfully compete for mates and pass on their genes, leading to the evolution of increasingly larger males over time. This theory is known as sexual selection, and it is a key aspect of Darwin's overall theory of evolution.

Darwin Argued That the Large Physical Size of Males Was