Just by eating sea urchins and destructive shellfish, sea otters are keeping kelp forests healthy and coastal erosion at bay.

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 ...

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

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A painful and unexpected moment unfolds after getting pricked by a sea urchin while exploring the ocean.

Two people have been rescued after a terrifying night at sea as six-meter (20-foot) waves tossed their stricken yacht nearly 200 miles (322 kilometers) off Australia’s eastern coast as they ...

A 53-foot sea creature washed up on a beach in Oregon, officials said. Getty Images/iStockphoto A 53-foot sea creature washed ashore after it was reported dead off the coast of Oregon.

While working on remote Alaskan islands, he found where sea otters were absent, sea urchin populations mushroomed, overtaking kelp forests.

Also known as "volcano snails," these gastropods grow a suit of metal-enriched scaly armor and have an enormous heart, which helps them survive in oxygen-poor water in the deep ocean.