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davidbriggs · 3447 days ago · link · · parent · post: Why is it a Color “Wheel” and Not a Color “Line”? | Eye Math
Yes, as indicated below, insects see ultraviolet. At the other extreme marine mammals have only one cone type, I think. A small minority of women are have four cone types, the usual L, M and S, plus a polymorphic variation of either the L or the M, but this doesn't necessarily mean that the retina is wired up to take advantage of the extra cone type. A recent investigation of 24 such women found that 23 had normal colour vision but one saw differences between pairs of stimuli that could be matched by all other observers.