Peacocks also use their tail feathers for display and communication. They spread their feathers in a fan-like shape to show off their beauty, and they make a distinctive calling sound to attract attention. The tail feathers are also used to warn off predators. When a peacock is threatened, it will spread its tail feathers and make a loud noise, which can scare away potential predators.
In conclusion, peacocks develop their tail feathers as a way to attract mates and communicate with other peacocks. The tail feathers are a sign of the male's health and fitness, and they are used in courtship rituals and for display and communication.