its an natural thing but scientific answer is that just to compare sexual reproduction or identifying male or female
Peafowls (male = peacock, female = peahen) are birds and have feathers.
Peacocks or Peahens
The gender of peacocks is masculine. The famine gender is peahen. Peacocks are large colorful bird with very long tail feathers than can be fanned out in display.
Feathers. A peacock has a very showy tail that he uses to entice a peahen into mating.
The peacock uses his feathers to court the female which is called a peahen. The Peahen can use her feathers in courtship, or to intimidate other females in their areas. They may also use them to scare predators from their babies.
A peacock (male) make use of bright coloured plumage, and fans its long tail feathers, shivering them to attract a rather drab coloured peahen (female) in order to mate.
Only male peacocks are actually called "peacock". The female of the species is called a peahen.
Do peacocks stay with the same peahen their whole lives
Just slightly smaller than peacocks.
Peacocks use their colourful display of feathers and long fan-like tail to attract the drabber female peahens for mating. The peahen incubates the eggs on the nest, so being drabber helps to avoid being noticed by predators.
Peacocks do not lay eggs, being males. Peahen eggs are an off-white.
Peacocks, actually called Peafowl, come from India, Burma and Java. The male is the peacock and the female is called a peahen