Stunning microscopic footage has captured the moment a translucent baby sea urchin crawled across a bed of red algae. The video earned fifth place in the annual Nikon Small World in Motion competition ...

Sea urchins are infamous for their painful spines. This experiment used an ultra realistic fake foot to test just how sharp ...

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 Earth, from ...

Purple sea urchins, beware: There’s a purple urchin-eating predator on the horizon — and its name is the sunflower sea star. That’s the plot line coming from a small upstart research facility in Moss ...