Sea Urchins see with their entire body


They don’t have eyes per se, but apparently detect light and form images by the way the shadows from the spines are falling on the surface of the body, creating one huge all-compassing compound eye. It is not 20/20-vision, but maybe as good as that of a nautilus. Still sounds confusing to me. Via


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Production engineer and certified swim coach. Full-time IT consultant, spare-time swimming aficionado. 2 sons, 2 daughters and a wife. President of the Faroe Islands Swimming Association. Likes to run :-)

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