With its ability to grow to as big as three feet across, armed with up to 24 limbs covered with tiny suction tubes, the sunflower star is a purple urchin-eating machine. But Bank said the sunflower ...

Beneath sea urchins’ exterior spines, rounded skeletons called tests are jewels of color, texture, and symmetry. There are hundreds of urchin species, and they’re found in every ocean on ...