Hi @mobbs I wonder if we might still be considered tetrachromatic, however one of the cones evolved into a rod, which gives us the ability to see better in low light. It is well known at low light levels we lose perception of color as the rods become active in our vision. The rods have sensitivity over a broader wavelength (at the bluer end of the spectrum) which explains the better low light detection.
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Yes rods are an additional feature - and also some humans notably have more cones than normal, mostly (or entirely?) women
But good little addition thanks! (upvoted for visibility)