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Why did we lose our fourth type of cone cell (in the eye)?

Most species of birds, reptiles and fish have four types of cone cells in their retina, thus they have four independent channels for conveying color information. They are: short-wave (S) cones: sensitive to colors with short wavelengths. middle-wave (M) cones: sensitive to colors with medium wavelengths. long-wave (L) cones: sensitive to colors with long wavelengths. […]