why do peacocks spread their feathers

Peacocks spread their feathers primarily for three reasons: to attract mates during the mating season, to intimidate predators, and to communicate vibrationally with other peafowl. The large, colorful display of feathers (called the "train") is used by males to impress females by showing off the brightness and iridescence of their eyespot patterns, which are signs of genetic fitness. They also angle their feathers at about 45 degrees to the sun to maximize the vibrant iridescent effect, enhancing their attractiveness. Additionally, the feathers produce vibrations and sounds (train-rattling) that contribute to the mating display and communication. Furthermore, the display can make the peacock appear larger and more intimidating to predators or rivals.