Light-sensitive proteins below colour-changing cells mean fish can ‘take a photo of their own skin from the inside’
What do you call a fish with no eyes? Fsh. What about a fish that can also use its skin as “eyes”? Well, that would be a hogfish.
Hogfish often use their ability to change colours to support their camouflaging abilities. They also have light-sensing skin, or skin vision, that can help them “see” their surroundings.
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