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Seeing color without color receptors

July 8, 2016

cuttlefishOne of the well-known ability of many octopuses is their ability to match their skin to their surroundings. Less well-known is that they do not have color receptors in their retinas. So how do they (and other cephalopods like the cuttlefish left) distinguish color? Biologists at Berkeley and Harvard have teased out that their weirdly shaped pupils scatter light depending on its color, and their weird nervous systems are able to process that. (Cite.)

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