A classic example of female choice and potential runaway selection is the long-tailed widowbird.
While males have long tails that are selected for by female choice, female tastes in tail length are still more extreme with females being attracted to tails longer than those that naturally occur.
These two forms of selection mean that some individuals have better reproductive success than others within a population, either because they are more attractive or prefer more attractive partners to produce offspring.
For instance, in the breeding season, sexual selection in frogs occurs with the males first gathering at the water's edge and making their mating calls: croaking.
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In general, males benefit from frequent mating and monopolizing access to a group of fertile females.
Females can have a limited number of offspring and maximize the return on the energy they invest in reproduction.
The concept was first articulated by Charles Darwin and Alfred Russel Wallace who described it as driving species adaptations and that many organisms had evolved features whose function was deleterious to their individual survival, and then developed by Ronald Fisher in the early 20th century.
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