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Deer possess dichromatic vision—they see short-wavelength colors, such as blue and violet, and middle-wavelength colors, such as green, but they cannot clearly distinguish long-wavelength colors or those near the red end of the visible spectrum. This is because dichromatic vision depends on two types of light-sensitive cone cells rather than the three types responsible for color vision in humans. Vision originates at the back of the eye, specifically in the retina. This thin layer of...