Tuesday, May 18, 2010
Sea Urchins See With Entire Body
Despite having no eyes, sea urchins can "see". The Journal of Experimental Biology reports that the urchin's entire body cannot only detect light but form images of its surroundings. The way in which the shadow of the urchin's spines falls on the urchin allows them to do so. Researchers posit that the denser the spikes, the better the vision.
Here's a video summary.