Peacocks are large, colorful pheasants (typically blue and green) known for their iridescent tails. These tail feathers, or coverts, spread out in a distinctive train that is more than 60 percent of the birds total body length and boast colorful eye markings of blue, gold, red, and other hues. The large train is used in mating rituals and courtship displays. It can be arched into a magnificent fan that reaches across the birds back and touches the ground on either side. Females are believed to choose their mates according to the size, color, and quality of these outrageous feather trains.