Purple sea urchins, beware: There’s a purple urchin-eating predator on the horizon — and its name is the sunflower sea star.

Join us on an exciting underwater adventure as we dive into the art of freediving and spearfishing. In this video, we ...

Hōnaunau Bay, Hawaii on 25 January, 2020. Sea urchin populations are ballooning in the bay, putting the coral reef at risk, a new study has found.

Sea urchins have no brains or hearts. But put them in the proximity of the unmistakable sunflower sea star, and somewhere in their pin cushion-like body, they sense trouble. That's the main ...

Scaling-up coral reef carbonate production: Sea-urchin bioerosion suppresses reef growth in Hawaiʻi. PLOS One, 2025; 20 (5): e0324197 DOI: 10.1371/journal.pone.0324197 ...

Their disappearance led to unchecked sea urchin growth, which in turn destroyed extensive ... what the disease is has really been a pretty major impediment to being able to move forward with all the ...