http://www.latimes.com/science/sciencenow/la-sci-sn-fossilized-fish-rods-cones-20141223-story.html
http://en.wikipedia.org/wiki/Vision_in_fishes
http://en.wikipedia.org/wiki/Evolution_of_color_vision
It appears that color vision arose some 500,000,000 years BC.
http://en.wikipedia.org/wiki/Vision_in_fishes
http://en.wikipedia.org/wiki/Evolution_of_color_vision
It appears that color vision arose some 500,000,000 years BC.
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