…and the chickens carry on regardless.
I thought that the photograph looked kind of unreal and it’s because of this many of the colours you see are not pigment but refraction:
Many of the brilliant colours of the peacock plumage are due to an optical interference phenomenon, Bragg reflection, based on (nearly) periodic nanostructures found in the barbules (fiber-like components) of the feathers.
Different colours correspond to different length scales of the periodic structures. For brown feathers, a mixture of red and blue is required: one colour is created by the periodic structure, and the other is a created by a Fabry–Pérot interference peak from reflections off the outermost and innermost boundaries of the periodic structure. Many colour mutations exist through selective breeding, such as the leucistic White Peafowl and the Black-Shouldered Peafowl.
Such interference-based structural colour is especially important in producing the peacock’s iridescent hues (which shimmer and change with viewing angle), since interference effects depend upon the angle of light, unlike chemical pigments.