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Humans have trichromatic vision. Deer, Elk (wapiti) and some other animals have dichromatic vision. It's not that deer and Elk can't "see" oranges and reds, they just perceive them differently. ...
Humans have trichromatic vision. Deer, Elk (wapiti) and some other animals have dichromatic vision. It's not that deer and Elk can't "see" oranges and reds, they just perceive them differently. ...