How does sexual selection explain the bright plumage of male peacocks and birds of paradise?

In zoology, the bright plumage of male peacocks and birds of paradise is explained by the theory of sexual selection, a concept first proposed by Charles Darwin to account for traits that appear disadvantageous to survival but provide a reproductive advantage.12

Sexual selection occurs when individuals of one sex—typically females—exhibit a preference for specific traits in the opposite sex, or when males compete with one another for access to mates. In many species, including birds of paradise and peacocks, these preferences drive the evolution of elaborate ornamentation and striking coloration.123

These traits function as signals of a male's quality:
* Genetic Robustness: Bright colors often signal to females that a male is healthy and genetically fit.2
* Vitality and Dominance: Elaborate displays can serve as tools for intimidating competitors or signaling dominance during courtship, which often occurs in communal areas known as leks.24
* Runaway Selection: According to the runaway selection hypothesis, female preference for a trait can become so strong that it drives the rapid evolution of extreme physical features in males over successive generations.5

While such conspicuous plumage makes these birds more visible to predators, the reproductive success gained by attracting mates outweighs the associated survival risks.12