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That certain tribes who live in a jungle setting can discern and have names for about 40 different shades of green, where a city dweller would see them all as being exactly the same shade.
I think I've read before that our eyes are most sensitive to the color green out of any other color, something about it that wavelength of light is absorbed more readily by the cones in our eyes. Being exposed to it daily and maybe having their survival dependent on it probably helps them develop that ability.
I thought it was red, for ripe fruits?
Nah, people are always confusing orange, red-orange, and red