More on this theory; https://www.science.org/content/article/how-colorblind-cuttlefish-may-see-living-color https://www.science.org/content/article/how-colorbl

More on this theory; https://www.science.org/content/article/how-colorblind-cuttlefish-may-see-living-color https://www.science.org/content/article/how-colorblind-cuttl... The w shaped pupil lets them see the polarization of light too, wild stuff.