The sea urchin is a marine invertebrate that, like the starfish, has no eyes but specific light cells scattered throughout the body. When there are changes in light, these beings hide in rocks, algae or shells.

Stock photo: The sea urchin is a marine invertebrate that, like the starfish, has no eyes but specific light cells scattered throughout the body. When there are changes in light, these beings hide in rocks, algae or shells. was taken by rkb5cssnfn .