Why does a peacock have multicolored feathers?

Peacocks have Bright Colors to Attract Peahens

A peacock, Pavo Cristatus, has multicolored feathers so he can attract and mate with as many peahens as possible.
The bright plumage draws attention to the male; showing off his vibrant feathers is a sign of health. His unnaturally large and disproportionate tail, which would otherwise hinder an animal's survival, is proof of his successful survivability; this is known as Handicap Theory. The loud peafowl call that echoes through the woods is a symbol of his dominance and vigor. His heavy tail-waiving and dancing is a sign of strength.
The entire display has the peahens swooning, or scientifically speaking 'sexually selecting' the male, which in turn ensures the production of future offspring.

First answer by Nirel. Last edit by Nirel. Contributor trust: 671 [recommend contributor]. Question popularity: 28 [recommend question]