State a reason to explain why male peacock has colourful feathers?

The colourful feathers of male peacocks are a result of sexual selection. Peacocks use their feathers to attract females during mating season. The more elaborate and colourful the feathers, the more attractive the male is to females. This is because the feathers are an indicator of the male's health and genetic fitness. Females are more likely to mate with males who have the most colourful feathers, as this increases the chances of producing healthy offspring.