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Evolution: Education and Outreach volume 11 , Article number: 13 Cite this article. Metrics details. Sexual selection occurs when animals of one sex compete to mate with members of the other. Members of one sex usually males may fight each other for the privilege of mating with members of the other, as in deer or sea lions.
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Sexual selection and the evolution of beauty: two views

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From one of the world's leading authorities on animal behavior, the astonishing story of how the female brain drives the evolution of beauty in animals and humans. Darwin developed the theory of sexual selection to explain why the animal world abounds in stunning beauty, from the brilliant colors of butterflies and fishes to the songs of birds and frogs. But if Darwin explained why sexual beauty evolved in animals, he struggled to understand how. Do animals have an inherent sexual aesthetic and, if so, where is it rooted? Ryan argues that the answers to these questions lie in the brain—particularly of females, who act as biological puppeteers, spurring the development of beautiful traits in males. This theory of how sexual beauty evolves explains its astonishing diversity and provides new insights about the degree to which our own perception of beauty resembles that of other animals.
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