Seals in captivity have been taught to paint and use colors. But as Kaplan and Rogers point out, they are colorblind. The cells of their retinas contain only green cones, so they can only see green. It is not clear why or how they choose different colors of paint.
While not related to seals, whales and dolphins (who have also been known to paint in captivity) have the same monochromatic vision. Kaplan and Rogers say that it is “likely to have evolved for life in the sea.”
Video uploaded by NewEnglandAquarium/YouTube
Photo from Thinkstock
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